Elimination approach:
Start with the class of chemical rather than the individual product name. Acetamiprid belongs to the neonicotinoid group, which is described in the list as acting on sucking pests - matching description (III). This pairing, A - (III), holds only in options (2) and (3); options (1) and (4), which assign A to (II) and (IV), are eliminated.
To separate the remaining two, look at B. Cypermethrin is a synthetic pyrethroid that works as a contact and stomach poison - description (I). Option (2) assigns B - (I), while option (3) assigns B - (IV), so option (3) is eliminated.
This confirms (A) - (III), (B) - (I), (C) - (IV), (D) - (II), i.e. option (2).