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Intermediate of a Reaction

APCHEM-UDYZME

Given the following multi-step reaction mechanism, which of the following can be classified as an intermediate?

$$O_2 \longrightarrow O + O$$

$$SO_2+ 2O \longrightarrow SO_4$$

$$SO_4+ SO_2 \longrightarrow 2SO_3$$

A

$O$ is the intermediate.

B

$SO_4$ is the intermediate.

C

Both $O$ and $SO_4$ are intermediates.

D

There are no intermediates in the reaction mechanism.