Concept:
Charvaka is a materialist school of Indian philosophy.
It accepts perception as the main valid source of knowledge and rejects many metaphysical entities like soul, rebirth and liberation.
Step 1: Check Assertion (A).
Charvaka does not accept an eternal soul separate from the body.
According to Charvaka, consciousness is connected with the material body.
So, Assertion (A) is correct.
Step 2: Check Reason (R).
The Reason says comparison is the only source of knowledge accepted by Charvaka.
This is incorrect.
Charvaka mainly accepts:
\[
\text{Perception}
\]
as the valid source of knowledge.
It does not accept comparison as the only source.
Step 3: Final conclusion.
Assertion is correct, but Reason is incorrect.
Hence:
\[
\boxed{\text{(C)}}
\]