Round 3.86 to the nearest tenth is it (a)3 (b)3.8 (c)3.9 (d)3.96

The number there is 6. Since 6 is bigger than 5 add one to 8 and six becomes zero C.3.9

C. 3.9
Since 6 is greater than 5, we can round up the digit that is in front of it, which in this case is 8. 8 rounds up to 9, therefore 3.9 is the correct answer.