Identify the part/parts of the sentence that is/are incorrect:
Although there is no direct evidence (A) / that salt is a cause of high blood pressure or hypertension, (B)/ there are studies which indicate that (C)/ reducing salt intake lower blood pressure.(D)

Correct option is D

Option (d) contains an error.
In part (d) —
"Reducing salt intake lower blood pressure" is incorrect.
Let’s break it down:
· The subject is "Reducing salt intake", which is a gerund phrase.
· Gerund phrases are treated as singular nouns, regardless of the object they carry.
So, the subject is singular, and hence the verb should also be singular.
· ❌ Incorrect: "lower" (plural verb)
· ✅ Correct: " lowers" (singular verb)
Correct sentence:
Reducing salt intake lowers blood pressure.
Grammatical rule used:
Subject-Verb Agreement:
· A singular subject takes a singular verb (adds "s" or "es" in present tense).
· A plural subject takes a plural verb (base form of the verb).
Explanation of the grammatical rule in Hindi: Subject-Verb Agreement के अनुसार, यदि कर्ता (subject) एकवचन है, तो क्रिया (verb) भी एकवचन होनी चाहिए।
यहाँ "Reducing salt intake" एकवचन कर्ता है, इसलिए "lowers" सही क्रिया है।
Analysis of other parts:
· (a) Although there is no direct evidence – ✅ Correct
· – Introduces a concessive clause; structure and verb use are accurate.
· (b) that salt is a cause of high blood pressure or hypertension – ✅ Correct
· – Well-constructed relative clause using appropriate article and subject-verb agreement.
· (c) there are studies which indicate that – ✅ Correct
· – Plural subject "studies" correctly followed by plural verb "are" and "which indicate".