Meter and second is the correct answer.
1 centigram is equal to 10 milligrams.
Divide 3.88 milligrams by 10 to convert into centigrams.
3.88 / 10 = .388
The answer is .388 centigrams.
Hey!
First, let's write the problem.

Subtract the numbers, we would do the following operation,


Add 2 to both sides.

This tells us that our final answer would be,

Thanks!
-TetraFish
Killed in accident or injured