Correct Usage of the Preposition "Against"
Step 1: Understanding the Rule
The preposition "against" is used when something is in contact with another surface for support.
Step 2: Eliminating Incorrect Options
- By (Option B): Indicates closeness but not direct contact.
- For (Option C): Indicates purpose, not position.
- To (Option D): Indicates direction, not physical leaning.
Step 3: Correct Usage
The correct sentence should be:
"He leaned against the wall for support."
Final Answer:
Thus, the correct answer is Option A ("against").