To find the common difference between the numbers, let us first find the difference between the second number and the first number.
(5/16) - (1/4) = (5 - 4)/16
= 1/16
Let us now find the difference between the third number and the second number
(3/8) - (5/16) = (6 - 5)/16
= 1/16
From the above two deductions, we can conclude that the common difference is 1/16 and the correct option among all the options given in the question is the first option.