Diagrammatic representation of trophic levels in an ecosystem is given below. Identify A, B, C and D by selecting correct option:
A. A - Primary producer, B - Secondary consumer, C - Primary consumer, D - Tertiary consumer
B. A - Primary consumer, B - Primary producer, C - Secondary consumer, D - Tertiary consumer
C. A - Primary producer, B - Primary consumer, C - Secondary consumer, D - Tertiary consumer
D. A - Tertiary consumer, B - secondary consumer, C - Primary consumer, D - Primary producer