Read the sentence to find out whether there is any grammatical or idiomatic error in it. The error, if any, will be in one part of the sentence. The corresponding letter of that part is the answer. If the given sentence is correct as it is, then choose option ‘No error’ as the answer response. (Ignore errors of punctuation, if any).

His constant tardiness was (A)/ no longer an excuse to (B)/his lack of responsibility in (C)/ meeting project deadlines (D).

Correct option is B

The incorrect part of the sentence is part (B):
(B) "no longer an excuse to"
The issue in this part is a preposition error. The correct preposition to use in this context is "for," not "to."
Excuse for: means to pardon or forgive him or her.
Here's the corrected sentence:
"His constant tardiness was no longer an excuse for his lack of responsibility in meeting project deadlines."
So, the grammatically correct sentence should have "for" instead of "to" in part (B).