Select the most appropriate word to fill in the blank.

Moisture created .......... multitudes of visitors over the years has damaged King Tut’s tomb more than any vandalism and so conservators are working to ............... the historic monument ............. the impact of heavy-breathing, heavysweating tourists.

A

by; guard; against

B

by; dry; off

C

from; dry; against

D

from; guard; from