Match List I (Crop) with List II (Rootstock):

Crop	Rootstock
a. Mango	I. Ziziphus nummularia
b. Grapes	II. Rough Lemon
c. Sweet Orange	III. 110 R
d. Ber	IV. Olour

Correct option is B

Mango → Olour (dwarfing rootstock)
Grapes → 110 R (resistant to nematodes, drought)
Sweet Orange → Rough Lemon (widely used in citrus grafting)
Ber → Ziziphus nummularia (hardy, desert-resistant rootstock)
✅ Matching:
· a–IV
· b–III
· c–II
· d–I → Option (B)