Heya cutie >//< (p. s this is for 26klutj) I'm trying to confess how I feel

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

(i think my answer is a, am i correct? ) a pentagonal traffic sign is a sign. a. school crossing b. parking c. wrong way d. yield

What computer software program was used to create the design for the structure above? what is the main advantage to this program?