Match List-I with List-II and select the correct answer:

List-I (Diseases)	List-II (Causative agents)
a. "Fire blight" of apple and pear	1. Pseudomonas solanacearum
b. "Crown gall" of tomato	2. Pseudomonas cirri
c. "Citrus canker"	3. Bacterium tumefaciens
d. "Brown rot" of Solanaceae	4. Bacillus amylovorus

A. a-4, b-3, c-2, d-1

B. a-2, b-1, c-4, d-3

C. a-1, b-2, c-3, d-4

D. a-3, b-4, c-1, d-2

Answer: Option A