How Did the Collapse of the Housing Bubble Cause a Contraction

How did the collapse of the housing bubble cause a contraction in output?

A) Because banks were unwilling to lend,many businesses were suddenly unable to access credit for their day-to-day needs.
B) When homeowners lost value in their homes,they stopped saving,which reduced banks' ability to lend.
C) Because consumers lost confidence in the banking industry,they stopped depositing money,so banks could no longer lend.
D) None of these explains how the housing bubble collapse led to reduced output.