The question is just worded badly.  It seems that the writer meant to ask:

1. If you were given the whole 172.16.0.0 network to use and you chose a /19
subnet mask to subnet it with, which of the folowing answers would be a
valid host in ONE of the resulting subnets.

versus

2. Which one of the following is a valid host using the address of
172.16.0.0 /19?

Those are two different questions with distinct answers.  Answer D is
feasible for question 1, but not for question 2.

a. 172.16.32.0

b. 172.16.64.0

c. 172.16.63.255

d. 172.16.80.255



-Jarrett

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