Explanation : The chance of getting ahead in the first throw
= 1/2
The chance of getting ahead in the second throw
= 1/2
The chance of getting ahead in the third throw
= 1/2
The chance of getting ahead in the fourth throw
= 1/2
Thus the probability of getting heads in all the throws
= (1/2) x (1/2) x (1/2) x (1/2) = 1/16
Hence the answer is (d).