A State Energy Agency Mailed Questionnaires on Energy Conservation to 1,000

A state energy agency mailed questionnaires on energy conservation to 1,000 homeowners in the state capital. Five hundred questionnaires were returned. Suppose an experiment consists of randomly selecting one of the returned questionnaires. Consider the events:

A: {The home is constructed of brick}
B: {The home is more than 30 years old}
D: {The home is heated with oil}

$\text { Which of the following describes the event } B \cup D C \text { ? }$

A) homes more than 30 years old that are not heated with oil
B) homes more than 30 years old or homes that are not heated with oil
C) homes more than 30 years old that are heated with oil
D) homes that are not older than 30 years old and heated with oil