Option 3 : The baby were
The correct answer is "The baby were"
- The erroneous part of the sentence is 'The baby were'
- The given sentence is an example of incorrect subject-verb agreement.
- The plural verb 'were' does not agree with the singular subject 'baby'.
- A singular subject of a sentence or clause requires a singular verb.
- Example: Rishi is coming to the park.
- We can use 'was' in the given sentence instead of were and 'aches' rather than ache.
The correct sentence is: The baby was not able to eat anything due to stomach aches.
Hence, the correct answer is option 3