Some Passwords Are Stored Using Specialized Encryption Algorithms Known as Hashes

Some passwords are stored using specialized encryption algorithms known as hashes. Why is this an appropriate method?

A) It is impossible to crack hashed user passwords unless the key used to encrypt them is obtained.
B) If a user forgets the password, it can be easily retrieved using the hash key stored by administrators.
C) Hashing is faster compared to more traditional encryption algorithms.
D) Passwords stored using hashes are non-reversible, making finding the password much more difficult.