The following sentence has been divided into parts. Identify the part that contains the grammatical error.
"A lot of efforts may (1)/ fell like they (2)/ are going unnoticed. (3)/ No Error (4)"

The incorrect part is "fell like they."
Detailed Grammar Explanation:
· "Fell" is the past tense of "fall."
· The sentence is in the present tense, so the correct verb should be "feel" instead of "fell."
Correction:
· "A lot of efforts may feel like they are going unnoticed."
Example
· "Sometimes, hard work feels like it is not being appreciated."