NEET Biology question

Which two of the following changes (i-iv) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)? (i) Increase in red blood cell size (ii) Increase in red blood cell production (iii) Increased breathing rate (iv) Increase in thrombocyte count Changes occurring are

• (A)(ii) and (iii)Correct
• (B)(iii) and (iv)
• (C)(i) and (iv)
• (D)(i) and (ii)