The student wondered why the sun constantly rises … the east

Analyze the question: This is a preposition question. We need the word that correctly fits "the sun constantly rises ___ the east."

Concept: The standard idiomatic expression in English is "the sun rises in the east and sets in the west." We use in with compass directions when we are talking about where something happens or appears, such as "in the east" or "in the north."

Checking each option:

• A. in: "The sun rises in the east." This is correct and is the standard, natural phrase.
• B. by: "rises by the east" is not idiomatic. "By" suggests nearness or the agent of an action.
• C. from: "rises from the east" is sometimes heard in everyday speech. It is not wrong in meaning, but the fixed expression, and the one examiners expect, is "in the east."
• D. within: "within the east" suggests being inside a boundary, which does not suit a direction.

Note on option C: "From the east" can appear in poetic or casual usage, as in "the wind blows from the east." It describes the direction of origin. For the sun, the established phrase uses in, so A is the best answer.

Answer: A. in

Exam tip: Memorize fixed phrases with prepositions: the sun rises in the east and sets in the west. When a question tests an idiom, choose the standard expression you have seen most often, not just any option that might make sense.