The teacher said to the class, "When . . . . . . . . finished your work, please pass . . . . . . . . up to me."

The correct answer is Option C: your, it

First, let's define the grammatical concepts involved:

Pronoun: A pronoun is a word that replaces a noun or noun phrase to avoid repetition. Examples include "he," "she," "it," "they," "you," "we," etc.

Possessive Pronoun: A possessive pronoun shows ownership or possession. Examples include "my," "your," "his," "her," "its," "our," "their." These pronouns are often used before nouns.

Now, let's analyze the sentence and the options:

The sentence requires a possessive pronoun to modify "work" because the work belongs to the students. Therefore, "your" (Option C) is correct. "Your work" means "the work that belongs to you (plural)." Options A and B use the personal pronoun "you," which is incorrect in this context.

The second blank requires a pronoun that refers to the completed "work," which is singular. "It" (Option C) correctly replaces "work" to avoid repetition. Option D uses "them," which is a plural pronoun and doesn't agree with the singular noun "work."

Therefore, only Option C uses the correct possessive pronoun ("your") and the correct singular pronoun ("it"). The complete correct sentence is: "The teacher said to the class, 'When you have finished your work, please pass it up to me.'"