Question

which sentence is written correctly and does not contain a pronoun-antecedent error?

the students tracked the butterflies as it moved through texas.

a single monarch can travel hundreds of miles before they stop to rest.

every butterfly follows its instinct to migrate south.

a single monarch can travel hundreds of miles before they stop to rest.

Explanation:

1. Analyze the first option: "The students tracked the butterflies as it moved through Texas." The antecedent "butterflies" is plural, but the pronoun "it" is singular. This is a pronoun - antecedent error.
2. Analyze the second option: "A single monarch can travel hundreds of miles before they stop to rest." The antecedent "a single monarch" is singular, but the pronoun "they" is plural. This is a pronoun - antecedent error.
3. Analyze the third option: "Every butterfly follows its instinct to migrate south." The antecedent "every butterfly" is singular, and the pronoun "its" is also singular. There is no pronoun - antecedent error here.
4. Analyze the fourth option: "A single monarch can travel hundreds of miles before they stop to rest." (This is a repeat of the second option) The antecedent "a single monarch" is singular, and the pronoun "they" is plural. This is a pronoun - antecedent error.

Answer:

C. Every butterfly follows its instinct to migrate south. (Note: Assuming the options are labeled A, B, C, D with A being the first option, B the second, C the third, D the fourth. If the original options have different labels, adjust accordingly. But based on the content, the correct sentence is "Every butterfly follows its instinct to migrate south".)