1. 

DILIGENT
A. Progressive
B. Brilliant
C. Inventive
D. Hard-working

Answer: Option D

Explanation:

Meanings of the given words:

Diligent = hard work or too careful to carry out task and duties.

Progressive = means reformer, taking ahead, enhancer.

Brilliant = exceptionally clever or talented.

Inventive = having the ability to create or design new things or to think originally.

Hardworking =  too careful to carry out task and duties or (of a person) tending to work with energy and commitment; diligent.

Therefore answer : Diligent = Hardworking .