I got up at 4 and woke my son up.
四時に( A )、むすこを ( B )ました。

a. A: おきて B:おこし
b. A: おきて B:さまし
c. A: めをさまして B:おこし
d. A: めをさまして B:さまし

The answer is a.

For you to get up at 6 and wake your son up, you need to follow these steps:
(for you) to wake up (in bed) めを さます → (for you) to get up おきる→ (for you) to wake your son up むすこを おこす → for your son to get up むすこが おきる

おこす(起こす) also has a meaning of “to raise (or “to make … upright) or “to cause.”

かぜで たおれた じてんしゃを おこした。
I picked up my bicycle which had been pushed over by the wind.

がっこうへ いく とちゅう、じこを おこした。
I caused an accident on the way to school.

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