Which of the following sentences is punctuated correctly?

a. Were you aware, that Daylight Savings Time begins tomorrow?
b. What most people do, is change their clocks in the morning, not the night before.
c. How you choose to wake up tomorrow, is up to you.
d. I hope that you do not oversleep, or we will be late for school.***

Right. :-)

To determine which of the following sentences is punctuated correctly, we need to review each option and identify any errors:

a. Were you aware, that Daylight Savings Time begins tomorrow?
In this sentence, there is a comma after "aware" which is incorrect. The correct punctuation would be: "Were you aware that Daylight Savings Time begins tomorrow?"

b. What most people do, is change their clocks in the morning, not the night before.
This sentence has a comma after "do" which is incorrect. The correct punctuation would be: "What most people do is change their clocks in the morning, not the night before."

c. How you choose to wake up tomorrow, is up to you.
This sentence is properly punctuated. There is a comma after "tomorrow" which separates the introductory clause from the main clause.

d. I hope that you do not oversleep, or we will be late for school.
This sentence is properly punctuated. There is a comma after "oversleep" which separates the two independent clauses connected by the coordinating conjunction "or".

Therefore, the correct answer is option d: "I hope that you do not oversleep, or we will be late for school."