The following sentence has been divided into four segments. Identify the segment that contains a grammatical error.
The manager noticed / that Pragya / was first to reach / the office on Saturday.

Correct option is B

Explanation:
The article “the” is missing before “first”. With ordinal numbers (like first, second, etc.), we always use “the”.
Correct Sentence:
...that Pragya was the first to reach the office on Saturday.
Grammar Rule:
Use “the” before ordinal numbers.
He was the first to arrive.