The correct option is D.
The value given is 3 23/66
23/66 = 0.34848
3 + 0.34848 = 3.34848
Thus, 3 23/66 = 3.348.
A bar line is placed on the top of the '48' portion of the answer to show that 48 is a repeating number in the decimal, that is, there are still a lot of 48 infront of the decimal point which we have not written as part of the answer.