Explanation:

- The jury (A): The term "jury" is used as a collective noun. It represents a group of people but can take either singular or plural verbs based on context.

- were divided (B): Here, "were" is used as a plural verb. This is correct because the sentence implies that the individual members of the jury had different opinions.

- in their opinion. (C): The phrase is correct as it implies multiple opinions, corresponding to the plural verb.

- No error (D): Since both the verb "were" and the pronoun "their" correctly align with the plural interpretation of "jury," this option denotes no grammatical error.

Correct Answer: Option:4 - d