Step 1: Understanding the Question:
This question tests knowledge of apple rootstocks and varieties.
Step 2: Detailed Explanation:
Scab resistance (A): Shalimar Apple-1 (II).
Dwarfing rootstock (B): M9 (I).
Low chilling (C): Anna (III).
Woolly apple aphid resistance (D): Merton 793 (IV).
Thus, the correct matching is A-II, B-I, C-III, D-IV.
Step 3: Final Answer:
Thus, the correct answer is A-II, B-I, C-III, D-IV, which corresponds to option (B).
[0.5cm]