Question

Bill was in an automobile accident. the events just prior to the accident are still a blur. bill demonstrates __________ amnesia.

Answer 1

Bill demonstrates retrograde amnesia.
Retrograde amnesia refers to the loss of memory that happened before a particular accident. In the case above, Bill cannot recall anything that occurred before he got into an automobile accident. This can be temporary and his memory may return, however, it can also be long-term and he may never recall what happened. 

Answer 2

Bill was in an automobile accident. The events just prior to the accident are still a blur. Bill demonstrates retrograde amnesia.