When Ophelia Voluntarily Buys a Cup of Tea from Tim

When Ophelia voluntarily buys a cup of tea from Tim Horton's for $1.25,

A) the seller's opportunity costs must be less than $1.25.
B) the seller's marginal benefits from $1.25 must be less than from the tea.
C) Ophelia's marginal benefits must be less than $1.25.
D) she is not making a smart choice.
E) Ophelia's opportunity costs must be greater than $1.25.