Which of the following is a counterexample to the statement "All odd numbers are divisible by 3"?

7 is a prime number

9 is divisible by 3

8 is not divisible by 3

3 is divisible by itself

For this case we have the following statement:

"All odd numbers are divisible by 3"

The options given are the following:

a) 7 is odd but not divisible by 3, therefore it is a counterexample of the given statement

b) 9 is odd and is divisible by 3, therefore it is not counter-example

c) 8 is an even number, it is not a counter-example

d) 3 is odd and affirms the given statement.

Therefore, the correct answer is option A.

Answer:

Option A

That 9 is divisible by 3.