Let's say I encode a message using a Book Cipher, except that for each symbol in the plaintext alphabet, I only use the first word in the book that starts with that letter to encipher it $($e$.$g$.,$ I use the first word that begins with a t to encode all t$\text{'}$s in the plaintext$).$ With respect to the type of mapping between the plaintext and ciphertext alphabets, which of the following ciphers is the result conceptually most similar to$?$

Group of answer choices

Caesar Shift cipher

Monoalphabetic substitution cipher

Monoalphabetic substitution cipher with homophones

Vigenere cipher

One$-$time pad cipher