Select the most appropriate option to fill in the blank.
The _______________ nature of the proposal led to extensive discussions and debates among the committee members.

Correct option is D

The correct option to fill in the blank is (d) contentious.
“Contentious” means likely to cause disagreement or argument. Since the sentence mentions extensive discussions and debates, the word that fits contextually is "contentious".
Example: The law turned out to be a contentious topic in the parliament.
Why other options are incorrect:
· (a) transparent – Means clear or open; doesn’t lead to debate.
· (b) simplistic – Means overly simple; not relevant to arguments.
· (c) agreeable – Means pleasant or acceptable; opposite of contentious.