A recent survey has shown that 68 percent of professional photos are of humans, 39 percent are of pets, and 17 percent are of both humans and pets. Suppose a professional photo is selected at random and it is of a human. What is the probability that the photo also has a pet?

Use conditional probability: among photos of humans, the fraction that also show pets is the percentage showing both divided by the percentage showing humans. So the probability is 17% ÷ 68% = 0.25. The correct choice is D, 0.25.

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