The correct answer is C.
A. The ringing of the alarm clock made me awake.
This is incorrect because it does not specify that the ringing of the alarm clock startled the person. It is possible that the person was already awake and simply heard the alarm clock ringing.
B. The alarm clock rang, startled and awakened me from sleep.
This is incorrect because it does not specify that the person was startled from the deep depths of slumber. It is possible that the person was only slightly asleep and was easily awakened by the alarm clock.
C. I was startled from the deep depths of slumber by the ringing of the alarm clock.
This is the correct answer because it specifies that the person was startled from a deep sleep by the ringing of the alarm clock.
D. The alarm clock rang and startled me from the depths of slumber.
This is incorrect because it does not specify that the person was startled. It is possible that the person was simply woken up by the alarm clock.