Answer:
D
Step-by-step explanation:
A passive sentence is when the subject of the sentence is acted on by the verb. That means it hasn't happened yet. "A: would be correct if it was "The sun WILL beat down on the thirsty travelers."
"B" would be correct if it was "Carla WILL go to the supermarket to get some supplies."
"C" would be correct if it was "Jason WILL bake a cake for his brother."
But because none of them (except D, of course) have a "will" in them, "D" is the correct answer.
Hope this helps! :)