【正确答案】 C

【答案解析】Agreement; Rhetorical construction
The noun phrase beginning with one is singular, as is one of its constituent parts, the village planning proposal, so any pronouns for which it is the antecedent should be singular; furthermore, any verb for which the noun phrase beginning with one ... is the subject should be in the singular. The verb detract is more appropriate to the thought being expressed than take.
A The plural pronoun their has a singular noun phrase as its antecedent, namely, the village planning proposal. (It is illogical to take the antecedent of their to be best characteristic .)
B The plural verb were does not agree with the singular subject. Also, the verb taking should be replaced by the verb detracting.
C Correct. The verb is correctly in the singular form.
D A best characteristic is awkward; the idea is better phrased as one of the best characteristics. Also the verb take should be replaced by the verb detract.
E Instead of the awkward sequence one was it did not, a better choice would be was that it did not.
The correct answer is C.