Richard Moves in with His Elderly Aunt to Look After

Richard moves in with his elderly aunt to look after her when she falls ill. She provides him with money to do the weekly shopping. However, Richard spends the money on a new TV and fails to call for medical assistance when his elderly aunt falls ill. As a result, she dies. Under which of the following categories might the law impose a duty on Richard to act?

A) Voluntary assumption of responsibility
B) Special relationship
C) Statutory duty
D) Contractual duty