Foundation
English
Verb
Noun
Tenses
Question
Read the sentence to find out whether there is any grammatical error or idiomatic error in it. The error, if any, will be in one part of the sentence. (Ignore errors of punctuation, if any). 
When two vowel (a) / sounds occurs in direct succession, (b) / the transition between them is often difficult to make. (c) / No error (d)
c
a
b
d
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Solution
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In this sentence, we would be understanding the mistake in the given phrases. In the second phrase, that it part (b), two plural forms are used consecutively, which is a wrong usage. The sentence should either have been "sounds occur in direct succession" or "sound occurs in direct succession". Thus in part (b) there is a grammatical error.
Option B is the right answer.