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

List-I (Diseases)	List-II (Causal agents)
a. Smut of sugarcane	1. Podosphaera leucotricha
b. White rust of crucifers	2. Albugo candida
c. Apple scab	3. Claviceps purpurea
d. Ergot of rye	4. Ustilago scitaminae

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

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

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

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

Answer: Option D