Identify the part (A–E) that contains a grammatical error in the sentence below. If there is no error, choose option E (No error). Sentence (split into parts): A) I personally feel that B) cleanliness in the city C) is one proof of the D) efficiently civic administration.

Introduction:
The focus here is adjective vs adverb choice and correct noun modification. "Efficiently" is an adverb; before a noun, we need the adjective "efficient".

Given Data / Assumptions:

• Opinion clause: "I personally feel that…".
• Abstract subject: "cleanliness in the city".
• Linking verb phrase: "is one proof of the…".
• Target noun phrase: "… civic administration".

Concept / Approach:
Attributive modifiers of nouns are adjectives, not adverbs. Therefore, "efficiently civic administration" is wrong. The correct phrase is "efficient civic administration" or "efficiently run civic administration" (adverb + participle + noun). The simplest correction is to change "efficiently" to "efficient".

Step-by-Step Solution:
1) Identify modifier type needed: adjective before "civic administration".2) Replace "efficiently" → "efficient".3) Optional style: also tighten C to "is proof of" instead of "is one proof of the", but that is stylistic.4) Correct sentence: "I personally feel that cleanliness in the city is proof of efficient civic administration."

Verification / Alternative check:
Alternative: "…is one proof of an efficiently run civic administration." Both are grammatical; the first is simpler.

Why Other Options Are Wrong:
A–C: Grammatically acceptable; only D contains the part-of-speech error.

Common Pitfalls:
Using adverbs where adjectives are required before nouns.

Final Answer:
D (Write: "efficient civic administration")