Please answer this question fast please please

Solution :

Sum of 3.14 and 1.674 = 3.14 + 1.674 = 4.814
Difference of 3.14 and 1.674 =  3.14 - 1.674 = 1.466

Let the number to be added be x.
According to the question , 
x + 1.466 = 4.814
Hence x = 4.814 - 1.466
= 3.348

Option b