Given figure represents food chains of a deciduous woodland linked together to form a food web.Which of the following constitute first trophic level of the grazing food chain and detritus food chain respectively.

Question

$\begin{array}{1 1} \text{a. Living oak leaf and dead oak leaf} \\ \text{b.Living oak leaf and earthworm} \\ \text{c.Moth caterpillar and earthworm} \\ \text{d.Living oak leaf in both.} \end{array}$