Final answer:
To round 65.789 to the nearest tenth, the correct answer is 65.8 (option A).
Step-by-step explanation:
To round 65.789 to the nearest tenth, we look at the digit in the hundredth place, which is 8. Since 8 is greater than or equal to 5, we round up the tenths place. Therefore, the correct answer is 65.8 (option A).