English Grammar – Spot the error (choose the erroneous segment or ‘‘No error’’). Sentence: You deserve to be rewarded by your successful completion of the entire work in such a short time.

Introduction / Context:
This question checks preposition choice after “rewarded.” Standard English uses “rewarded for + noun/gerund” to express the reason. “Rewarded by” changes the meaning to “rewarded through/with the agency of,” which is not intended here.

Given Data / Assumptions:

• Verb phrase: “deserve to be rewarded …”.
• Cause/reason intended: “your successful completion …”.
• Current preposition: “by” (incorrect for reason).

Concept / Approach:
Use “for” to mark the reason: “rewarded for your successful completion …”. Use “by” only to mark the agent in passive voice (“rewarded by the company”), not the reason. Therefore, the preposition in segment B is wrong.

Step-by-Step Solution:

Verification / Alternative check:
Test a simple noun: “rewarded for excellence” vs. “rewarded by excellence.” Only “for” expresses cause correctly.

Why Other Options Are Wrong/Acceptable:

• A, C, D: Grammatically sound.
• E: Not valid since B contains a definite prepositional error.

Common Pitfalls:
Confusing “by” (agent) with “for” (reason); overextending passive-agent “by” to mark cause.

Final Answer:
rewarded by your successful