Read the given sentence to find out whether there is any grammatical or idiomatic error in it. The error, if any, will be in one part of the sentence. The corresponding letter of that part is the answer. If the given sentence is correct as it is, then choose option 'No error' as the answer response.

Although the young musician was (A)/ hesitant to perform in public, (B)/ he gracefully received his award (C)/ and stepped of the podium (D)..

The correct answer is D.

Step-by-step explanation:

1. Let us analyze each part of the given sentence:
- Part (A): "Although the young musician was" – This introduces a concessive clause and is grammatically correct.
- Part (B): "hesitant to perform in public," – This completes the adjective phrase and subordinate clause correctly.
- Part (C): "he gracefully received his award" – This forms the main clause with correct subject-verb agreement and adverb placement.
- Part (D): "and stepped of the podium.." – This part contains a prepositional error.

2. Error Analysis:
The word "of" is misused here. The preposition "of" expresses relationship, origin, or possession. To indicate movement away from or down from a surface or elevated position (like a podium), the correct preposition to use is "off".

3. Corrected Sentence:
"Although the young musician was hesitant to perform in public, he gracefully received his award and stepped off the podium."

Therefore, the grammatical error lies in part D.