Question

copper flashing is applied to roofs because it
a prevents birds from nesting.
b acts as a good insulator.
c is very durable.
d does not bend.

Explanation:

Copper flashing is used on roofs mainly because of its durability. Copper is resistant to corrosion and can withstand various weather conditions over a long period. It is not primarily used to prevent bird nesting (A). Copper is a good conductor, not an insulator (B is incorrect). And copper is malleable and can bend (D is wrong).

Answer:

C. is very durable.