Select the option that will improve the bracketed part of the sentence. In case no improvement is needed, select ‘No improvement required’.
(Neither of the leading political parties have had much) success in the southern region.

Correct option is B

Option (b) is the correct improvement.
Error: The subject Neither is singular and should be followed by a singular verb (has) rather than a plural verb (have).
Grammatical rule used: Neither and either are singular and require singular verbs.
Corrected sentence: Neither of the leading political parties has had much success in the southern region.
Example: Neither of the candidates has met the eligibility criteria.