IMO Answer is A
UV near equator help in reducing cancer -->so people living in high altitudes (are at more risk due to low UV)
What would help -- is UV the only reason, any alternate possibility
a) Does seasonal affective disorder, experienced frequently at high latitudes than at the equator, predispose its sufferers to cancer ---evaluate is there alternate cause -- Correct
b) common cold-- irrelevant
c) Can blood levels of vitamin D be raised - we are concerned about the study ,
...
UV near equator help in reducing cancer -->so people living in high altitudes (are at more risk due to low UV)
What would help -- is UV the only reason, any alternate possibility
a) Does seasonal affective disorder, experienced frequently at high latitudes than at the equator, predispose its sufferers to cancer ---evaluate is there alternate cause -- Correct
b) common cold-- irrelevant
c) Can blood levels of vitamin D be raised - we are concerned about the study ,
...
