Select the correct match. (I) (II) (III) (a) + (i) - (P) Amensalism (b) - (ii) - (Q) Commensalism (c) - (iii) 0 (R) Predation (d) + (iv) 0 (S) Competition

Correct option is A. a-iv-Q, b-iii-P, c-ii-S, d-i-R
Commensalism is a long-term biological interaction in which members of one species gain benefits while those of the other species neither benefit nor are harmed.
Amensalism is a type of biological interaction. It is an association between two organisms if different species where one is adversely affected and the other stays unaffected.
Competition is an interaction between organisms or species in which both the organisms or species are harmed.
Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey.
So, the correct answer is 'a-iv-Q, b-iii-P, c-ii-S, d-i-R'