$-0123456789+,-{0123456789}_{+},$

Consider the following elementary steps that make up the mechanism of a certain reaction:

$2A+BC+D$

$A+CB+2E$

A$)$ Which species is an intermediate? Options $=$ A $/$ B $/$ C $/$ D $/$ E

B$)$ Which species is a catalyst? Options $=$ A $/$ B $/$ C $/$ D $/$ E

C$)$ Write the rate law for step $1$ of the reaction. Do not include any spaces.

Rate $=$