Respuesta :
Answer: B. adjective
Explanation:
The part of speech refers to the syntactic function of a word. Arid is an adjective which means that it is primarily a modifier for nouns or phrases acting as nouns.
For instance, ''the Sahara desert is arid.'' Arid here modifies Sahara desert by letting the reader know that the Sahara desert lacks rainfall and is too dry to support agriculture.