A
Only one
B
Only two
C
All three
D
None
Correct answer: (c) All three
Explanation
- A
Only one
Only one. All three are legumes.
- B
Only two
Only two. Under-counts.
- C
All three
All three. Groundnut, horse-gram and soybean are Fabaceae.
- D
None
None. All belong to the pea family.
Summary. Official key is (c) all three. Groundnut (Arachis), horse-gram (Macrotyloma) and soybean (Glycine) are legumes — the pea family (Fabaceae).