Final answer:
The word 'stealthy' is an adjective from the provided options that makes a sentence more descriptive by indicating how someone or something acts or moves in a secretive manner.
Step-by-step explanation:
The adjective among the options provided that can be used to make a sentence more descriptive is c. stealthy. An adjective is a word that describes or modifies a noun or pronoun, giving more information about it, such as its appearance, color, size, or other qualities. The word 'stealthy' describes someone or something sneaky or moves in a secretive manner. For example, we could use 'stealthy' in a sentence like 'The stealthy cat moved silently towards its prey.'