Improve the highlighted part of the sentence. Choose ‘No improvement’ as an answer if the sentence is grammatically correct.
Since 1950 the number of children in secondary schools has been increasing noticeable.

Correct option is D

The correct improvement is (d) has been increasing noticeably.
· Explanation: The word “noticeable” is an adjective, but an adverb is required to describe the verb “increasing”.
· “Noticeably” is the correct adverb form.
Grammatical Rule (English):
· Use an adverb to describe or modify a verb.
· “Has been increasing” is a continuous action, so the degree must be shown by an adverb like “noticeably”.
Grammatical Rule (Hindi):
· क्रिया (जैसे बढ़ रही है) को दर्शाने के लिए adverb (जैसे स्पष्ट रूप से) का प्रयोग किया जाता है।
· उदाहरण: वह तेज़ी से भाग रहा है = He is running quickly.
Meanings of all options:
· (a) have increasingly noticeably – subject-verb disagreement ❌
· (b) increasingly noticeable – adjective form, not suitable here ❌
· (c) No improvement – incorrect, original sentence is wrong ❌
· (d) has been increasing noticeably – correct verb and adverb agreement ✅