Explanation:

- To find the probability that at least one of A or B passes, we use the formula for the probability of the union of two events.

- P(at least one passes) = P(A passes) + P(B passes) - P(both pass).

- We know P(A passes) = 0.7 and P(B passes) = 0.8.

- The probability that both A and B pass is the product of their individual probabilities, assuming independence: P(A and B pass) = 0.7 * 0.8 = 0.56.

- Then, P(at least one passes) = 0.7 + 0.8 - 0.56 = 0.94.

Option 3 - 0.94 is the correct answer!