You definitely cannot use any piece of art A. that is public domain

B. with a copyright symbol

C. that is over 100 years old

D. without any indication of who made it

The caves at lascaux were closed in 1963 because a. vandals were destroying the paintings b. the collective breath of the many visitors caused the paintings to corrode c. the weather was destroying the paintings d. the government of france wanted scholars to be able to study the work without distraction