Correct answer: (d) Hapur
Explanation
- A
Hamirpur
Hamirpur in the Bundelkhand tract is a large district by area (thousands of square kilometres). It is not the smallest in this list.
- B
Hathras
Hathras (Mahamaya Nagar) is a western UP district of moderate size, larger than Hapur, so it is not the smallest among the four.
- C
Hardoi
Hardoi in central UP is a bulky agricultural district, far larger in area than the NCR-side creations.
- D
Hapur
Hapur, carved from Ghaziabad, is the smallest in area among Hamirpur, Hathras, Hardoi and Hapur. That is the official key.
Summary. Official key is (d) Hapur. Among the four names, Bundelkhand’s Hamirpur and Awadh’s Hardoi are expansive; Hathras is mid-sized; Hapur is a compact western district. The question is comparative, not ‘smallest in all of Uttar Pradesh’. Honour the stored letter (d).