If nancy receives an encrypted message from matthew, which key does she use to read it? nancy’s private key nancy’s public key matthew’s private key matthew’s public key

Nancy's private key

Explanation:

She's receiving it.  That means Matthew used her public key to encrypt it.  She should decrypt it using her private key.  Watch this video for clarification :)

Watch The Internet: Encryption & Public Keys on the big video site which cannot be named on :p