Question

Fill in the blank with the appropriate option:
This is the only song _______ lyrics I do not know.
A. Whom
B. That
C. Which
D. Whose

Answer 1

Pronoun is a word that substitutes for a noun or takes the place of a noun. For example: I, me, he, she, herself, each, few, they, that, many and etc.
Here, in this question a relative pronoun is used. Relative pronouns are those pronouns that often introduce dependent clauses in the sentence. The most common relative pronouns are: whose, who, whom, which, that.
There are forms of pronouns:

Pronoun Type	Members of the Subclass	Example
Possessive	mine, yours, his, hers, ours, theirs	The blue book is mine
Reflexive	myself, yourself, himself, herself, itself, oneself, ourselves, yourselves, themselves	She injured herself playing football
Reciprocal	each other, one another	They really love each other
Relative	that, which, who, whose, whom, where, when	The novel that you gave me was really interesting
Demonstrative	this, that, these, those	This is a new jeep
Interrogative	who, what, why, where, when, whatever	What did she say to you?
Indefinite	anything, anybody, anyone, something, somebody, someone, nothing, nobody, none, no one	There's something in my bag

Complete step by step answer:
Option A) Whom - is an incorrect option because whom is used to refer to the object of a verb or preposition. Here in the options relative pronouns are given and the relative pronoun who does not fit in the sentence. ‘This is the only song whose lyrics I do not know’ is an incorrect sense. Hence, this is an incorrect answer.
Option B) That – is an incorrect option because “that” is a relative pronoun and “that” can be used for both people and things. ‘That’ does not go with our statement ‘this is the only song that lyrics I do not know’ is a wrong sentence. Hence, this is an incorrect answer.
Option C) Which – is an incorrect option because “which” is used for the direct questions and statements. For example: She seemed more talkative than usual, WHICH was because she was nervous. However, which does not go with our statement in this question and portray wrong sense in the sentence ‘‘this is the only song which lyrics I do not know’. Hence, this is an incorrect answer.
Option D) Whose – is a correct answer because whose is a relative pronoun and it is used to indicate the following noun belongs to or is associated with the person or thing mentioned in the statement. Hence, this is the correct answer.
This is the only song whose lyrics I do not know.

Thus, the option (D) is correct.

Note: Glycolysis or EMP pathway takes place in two phases. They are preparatory phase and pay off phase. The preparatory phase deals with the first five of ten catalytic reactions. And the payoff phase deals with the last five reactions.