Inmates at the Federal Penitentiary at Lompoc, California, Accepted Packages

Multiple Choice

Inmates at the federal penitentiary at Lompoc, California, accepted packages of mackerel in exchange for goods and services. Why were they willing to accept mackerel in exchange for goods and services?

A) because mackerel is a good source of protein
B) because prison authorities deemed mackerel legal tender
C) because the inmates know that they could use the packages of mackerel to buy other goods and services
D) because the inmates do not wish to consume mackerel