Option (a) ⇒ If the number is even meaning that if last digit is 0,2,4,6,8 than it is divisible by three.
Option (b) ⇒ The divisibility test of 3 says that if the sum of all the digits is divisible by three than the number is divisible by three. Therefore this option is correct.
Option (c) ⇒ If the number is divisible by both 3 and 2 than it is divisible by 6.
Option (d) ⇒ if the sum of all digits is divisible by 9 than the number is divisible by 9.
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