The correct answer is C. Dry.
Arid, parched, and droughty all mean dry. Draft is a current of air, earth is the planet we live on, and cow is a large hoofed mammal.
Dry is the opposite of wet. It can be used to describe a lack of moisture in the air, soil, or other substances. It can also be used to describe something that is not fresh or juicy.
Arid is a word that is used to describe a region that receives very little rainfall. This can lead to a lack of vegetation and other life.
Parched is a word that is used to describe something that is very dry. This can be used to describe the ground, skin, or lips.
Droughty is a word that is used to describe a period of time when there is very little rainfall. This can lead to a number of problems, including crop failures and water shortages.