Find the incorrect part of the sentence:
No less than fifty students were absent.

Correct option is D

Option (d) contains an error.
Detailed explanation: With countable plural nouns (students), the correct quantifier is “fewer,” not “less.” Therefore, the phrase should be “No fewer than fifty students were absent.” “Less” is generally used with uncountable nouns (less water, less time), whereas “fewer” is used with countable items (fewer books, fewer people).
Grammatical rule used:
· Use fewer with countable nouns; use less with uncountable mass nouns.
· Corrected sentence: No fewer than fifty students were absent.
· Example: Fewer cars were on the road today. / Less traffic was reported in the morning.
· Information booster / exceptions: In certain set phrases measuring time, money, distance, weight, percentages, “less” is common: less than 5 km, less than ₹500, less than 10%. But with straightforward countable nouns like students, use fewer.