The intricate tunnel network constructed by leafcutter ants serves as a highly organized underground city. Within this subterranean system, a complex division of labor, which includes specialized roles for workers of different sizes, ensure that the colony functions efficiently.
Which choice best corrects the underlined word to maintain proper subject-verb agreement?
- ANO CHANGE
- ensuresAnswer
- Censured
- Dare ensuring
Answer
The correct verb form is the singular, present-tense 'ensures' to agree with the singular subject 'division'.
The true subject of the clause is the singular noun 'division'. The plural nouns 'roles', 'workers', and 'sizes' are part of an intervening relative clause and do not affect the subject's number. Therefore, the singular verb 'ensures' is required. Since the rest of the passage is in the present tense ('serves', 'functions'), the present-tense form 'ensures' maintains the correct tense consistency.
Step-by-Step Solution
Key Concept
Subject-Verb Agreement