This question consists of a sentence which is divided into four parts numbered (1) to (4). Only one part of the sentence is not acceptable in standard written English. Identify that part which contains an error.

Correct option is C

The error lies in (c) senior than Mr. Verma.
Explanation:
· The word "senior" is a comparative adjective that does not take the preposition "than" but instead requires "to."
· Correct form: "senior to Mr. Verma."
Correct Sentence: "Though younger in age, Mr. Sharma is senior to Mr. Verma in the official hierarchy."
Grammatical Rule: For comparatives like senior, junior, superior, inferior, prior, anterior, and posterior, the preposition "to" is used instead of "than."
Explanation in Hindi: "Senior" जैसे विशेषण (adjectives) के साथ हमेशा "to" का प्रयोग किया जाता है, न कि "than"।
· सही वाक्य: "हालाँकि उम्र में छोटे हैं, श्री शर्मा आधिकारिक पदक्रम में श्री वर्मा से वरिष्ठ हैं।"
Analysis of other parts:
· (a): Correct; "Though younger in age" is grammatically correct.
· (b): Correct; "Mr. Sharma is" is appropriate.
· (d): Correct; "in the official hierarchy" is accurate.