If a number is divisible by 2, then it's last digit will be an even number.
If a number is divisible by 5, then it's last digit will be either 0 or 5.
If a number is divisible by 10, then it's last digit will be 0.
Hence divisibility by 2, 5,10 can be checked by looking at the last digit of the given number.
So option 'a' is the answer.