Select the most appropriate ANTONYM of the given word.
Dense

Correct option is A

The word "dense" means closely packed together or thick. The most appropriate antonym is "sparse," which means thinly dispersed or scattered. Therefore, the most appropriate antonym is: (a) Sparse.
· Synonyms of "dense": thick, compact, crowded, solid.
· Antonyms of "dense": sparse, thin, scattered, loose.
Meanings of the other words:
· Opaque (b): Not able to be seen through; not transparent.
· Closed (c): Shut or not open.
· Thick (d): Having a large distance between opposite sides or surfaces; dense.