Q: Which graha signifies whirlpool of repetitive thoughts?

(A) Sun
(B) Jupiter
(C) Rahu
(D) Mars

A: Repetitive thoughts are due to the patterns engraved in the mind called Samskaras & vasanas. When there is whirlpool of such thoughts, it is due to obsession or mental patterns that have become extremely strong. Obsession is signified by Rahu which eclipses reflected consciousness or Sun. Hence, option (C).