Write the smallest 4 digit number formed using the digits 8, 3, 0, 1

Smallest digit is “0”.Since a number cannot start with 0,we will put it in second place.

The second smallest digit is “1”, so the number will start with 1

After 1,the smallest digit is 3 and then 8.

Therefore, the smallest 4-digit number using the given digits 8, 3, 0, 1  is  as below;

1038

Hence, option(A) is the correct one