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## To solve this problem, we can set up a proportion comparing the height of the alien to the height of the tree based on their respective shadow lengths:

Alien's height / Alien's shadow length = Tree's height / Tree's shadow length

Let x represent the height of the tree. The proportion can be written as:

5 / 8 = x / 32

Cross-multiplying, we get:

8x = 5 * 32

8x = 160

Dividing both sides by 8, we find:

x = 20

Therefore, the height of the tree is 20 feet. So the correct answer is:

20 feet.