Many countries restrict the use or exportation of cryptographic systems. What is the reason given when these types of restrictions are put into place?

A.
Without standards, there would be many interoperability issues when trying to employ different algorithms into different programs.

B.
It can be used by some countries against their local people.

C.
Criminals could use encryption to avoid detection and prosecution.

D.
Laws are way behind, so adding different types of encryption would confuse the laws more.

Explanation:
The U.S. has greatly reduced their restrictions on cryptography
exportation, but there are still some restrictions in place. Products that use
encryption cannot be sold to any country the U.S. has declared as terrorist. The
fear is that the enemies of the country will use encryption to hide their
communication and the government would not be able to properly break this encryption
and spy on their data transfers.