Which of the following sequences of architectural features is in the correct chronological order of development?
a. pointed arch, steel frame construction, frame construction
b. pointed arch, barrel vault, cast-iron construction end of exam
c. post and lintel construction, groin vault, pointed arch

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