Identify the part with an error; if none, select ‘‘No error.’’ Sentence: No girl in her troupe is so sprightly as your daughter.

Introduction / Context:
This checks degree-of-comparison idiom with negative constructions.

Given Data / Assumptions:

• Structure used: ‘‘No + noun + is so + adjective + as + comparator.’’
• Goal: state that the comparator (‘‘your daughter’’) exceeds all others in the set.

Concept / Approach:
In negative contexts, the idiom ‘‘so … as’’ is standard: ‘‘No other athlete is so fast as X.’’ The affirmative counterpart uses ‘‘as … as’’ (e.g., ‘‘She is as sprightly as…’’). Thus, ‘‘so sprightly as’’ is correct with ‘‘No girl…’’

Step-by-Step Solution:
Check polarity: ‘‘No girl’’ makes the clause negative.Apply idiom: negative → ‘‘so … as’’ is acceptable and idiomatic.Confirm agreement and article usage: all fine.

Verification / Alternative check:
Equivalent rewording: ‘‘Your daughter is sprightlier than any girl in her troupe.’’ Meaning is preserved.

Why Other Options Are Wrong:
They are not erroneous; each part fits the correct idiom and grammar.

Common Pitfalls:
Assuming ‘‘as … as’’ is mandatory everywhere; with negatives, ‘‘so … as’’ is also correct and often preferred.

Final Answer:
No error.