What Is the Result If Professor Mumbler Decorates His Own

What is the result if Professor Mumbler decorates his own home?

A) This activity is excluded from GDP because it is not productive work.
B) This activity is excluded from GDP because an intermediate good is involved.
C) This is a productive activity but is excluded from GDP because no market transaction occurs.
D) This activity is included in GDP because it reflects production.
E) This activity is included in GDP only to the extent of Mumbler's opportunity costs.