Which two of the following changes (a – d) usualy tend to occur in the plain dvellers when they move to high altitudes (3,500 m or more) ? <br> (a) Increase in red blood cell size <br> (b) Increase in red blood cell production <br> (c) Increased breathing rate <br> (d) Incrase in thrombocyte count <br> Changes occurring are –

Question

( A ) (a) and (b)
( B ) (a) and (d)
( C ) (b) and (c)
( D ) (c) and (d)