Answer:
<h2>B. 72 + 78 + 70 + x > 289</h2>
Step-by-step explanation:
To solve this problem, you just have to remember that "at leat" means a least value, that is, John must have 289 or more points to pass the exam. Therefore is he has > 289, he definitely will pass.
So, the right expression must include the sum of all scores with a > sign.
The exact expression would be

Therefore, the right answer is B.