Assertion:
Astrological forecasts published in various magazines often vary.
RI. Different astrologers have their own methodology of making predictions.
RII. Different astrologers have studied at different universities.
Answer: A
"What causes the variance in forecasts"?
Answer to the above question is well explained by RI and hence it is a valid reason.
RII : If astrology is a science or a study, its methodology and practice cannot vary from one university to another.
Hence, RII is not a valid reason.