A19th-century explorer crossing a desert has run out of water. he has the best chance of surviving if he can finda. a rain shadow. b. an ephemeral stream. c. an oasis. d. a playa.

The correct answer is option C. an oasis.

Explanation:

An oasis is a geographical area or unexpected natural water source that is present in the desert. These water resources provides the very much needed relief by providing water to the organisms, animals and help in growing vegetation in the desert and dry area.

It can provide water and relief from sun and heat by providing shade and needed water as it offers not just water but a shelter to the animals, if it is a large enough for human settlements and crop nearby it.

Thus, the correct answer is option C. an oasis.

C. An oasis

Explanation:

An oasis is a cultivated area in a desert or semi-desert environment.