"Manifest" means to display, show, or reveal something clearly. The antonym "disguise" involves concealing or hiding one's true identity or the true nature of something. So, in a short explanation, while "manifest" involves revealing, "disguise" involves concealing or hiding.

In the context of the sentence, the teacher is asking about the kind of land suitable for growing wheat. "Fertile" means capable of producing abundant vegetation or crops, while "barren" means not suitable for cultivation or lacking in vegetation. Therefore, option (C) Barren is the opposite or antonym of "fertile" in this context.

"Evident" means clear and obvious, so the opposite or antonym would be "Indistinct," which indicates something not clear or not easily perceived. Therefore, option (B) Indistinct is the most suitable antonym in this context.