Final answer:
William Faulkner used the stream of consciousness technique in "As I Lay Dying" to present the thoughts and motives of multiple characters concerning the family matriarch's death.
Step-by-step explanation:
The writing technique William Faulkner used in "As I Lay Dying" is a) Stream of consciousness. This modernist literary technique captures the internal thoughts and feelings of characters in a way that mimics the natural flow of human thought. In "As I Lay Dying", Faulkner employs this style to convey the story through multiple viewpoints, with each of the fifteen characters providing a unique perspective on the death and burial of the family matriarch.
Faulkner is known for using Yoknapatawpha County as a setting for his works, and for bringing to life the Southern American experience through his complex and intricate narratives that often delve into the universal truths of the human condition.
As I Lay Dying is one of the prime examples where Faulkner's use of stream of consciousness reaches new heights in its exploration of characters' psychologies and perceptions.
Therefore answer is a) Stream of consciousness.