The answer is B
A salt is an extra layer of security used when storing sensitive data. It is a random string that is added to the input data before being hashed.
Even though a hash function is already asymmetrical (cannot be decrypted), if multiple users have the same password, their hashed passwords would still be the same. Therefore if there were to be a data breach, a hacker could recognize duplicate hash values and guess what the passwords might be by trying common passwords such as "password" or "12345".
When a salt is added, the hash value of two identical passwords will be different.
