Error spotting (exam direction): Identify the erroneous part (A/B/C) in the sentence — choose D if there is no error — 'Jayesh is getting / fatter because he / does not take exercise at all / No error.'

Given sentence parts (A–D)
A. Jayesh is gettingB. fatter because heC. does not take exercise at allD. No error.

Concept/Approach (comparative vs. positive form and idiom)
In careful formal usage, we typically say 'is getting fat' or 'is putting on weight'. The comparative 'fatter' normally contrasts explicitly with another state (often marked by 'than …') or is used when a comparative context is established. Since Part B supplies a bare comparative without an overt comparator, many standard keys flag it for improvement.

Step-by-step correction
1) Replace comparative with the positive form: 'is getting fatter' → 'is getting fat' (or 'is putting on weight').2) Optional idiom in Part C: 'does not take exercise' can be strengthened to 'does not take any exercise' for naturalness.3) Corrected version: 'Jayesh is getting fat because he does not take any exercise at all.'

Verification/Alternative
Where a comparative context is explicit (e.g., 'Jayesh is getting fatter than before'), 'fatter' is fine. Without it, the positive adjective reads more idiomatically.

Common pitfalls
Using a comparative adjective with no clear 'than'-phrase or previously established baseline.

Final Answer
B — 'fatter because he' (prefer 'is getting fat …').