Final answer:
The statement that can be used to disprove the conjecture is 5 ÷ 9 = 0.6.
Step-by-step explanation:
To disprove the conjecture that the quotient of any two integers is an integer, we need to find an example where the quotient is not an integer. Examining the given statements, we can see that option b) 5 ÷ 9 = 0.6 is the correct choice. A quotient of 5 divided by 9 does not result in a whole number, therefore disproving the conjecture.