Match List-I (Diseases) with List-II (Causative agents) and select the correct answer:

List-I	List-II
a. Covered smut of Barley	1. Alternaria solani
b. Early blight of Potato	2. Ustilago hordei
c. Red rot of Sugarcane	3. Xanthomonas citri
d. Citrus canker	4. Colletotrichum falcatum

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

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

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

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

Answer: Option B