Directions (10-13): In the following question, sentences are given with a part in bold. The given phrase in bold may or may not contains an error. The options following can replace the incorrect phrase. The correct phrase that is to be replaced will be your answer. If the sentence is correct then select ‘No improvement required’ as your answer.

Teams made up of a number of instructors working together are crucial in fostering creativity.

The correct answer is No improvement required.

Detailed Explanation:

Let us analyze the given sentence and the bolded phrase: "Teams made up of a number of instructors working together are crucial in fostering creativity."

1. Phrasal Verb Usage:
The phrasal verb "made up of" means "composed of" or "consisting of". It is correctly used here to describe the composition of the teams (teams consisting of a number of instructors).

2. Subject-Verb Agreement and Grammar:
The main subject of the sentence is the plural noun "Teams". The past participle clause "made up of a number of instructors working together" modifies "Teams". The plural verb "are" correctly agrees with the plural subject "Teams".

3. Evaluation of Options:
- "Teams make up of": Grammatically incorrect because "make up of" in the active form is incorrect in this passive modifying context.
- "Team made up in": Uses an incorrect preposition ("in" instead of "of") and changes the plural "Teams" to singular "Team", which creates agreement issues with "are".
- "Teams made up by": The preposition "by" implies agency (who created them) rather than composition.
- "Team making up of": Incorrect present participle usage and preposition combination.
- "No improvement required": The original sentence is grammatically sound, natural, and free of errors.

Therefore, the sentence is entirely correct as written.