a,the
an, an
The general rule for articles:
The correct usage is:
"an M.P., an M.L.A."
Thus, the correct answer is (D) "an, an".
Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?