What is a hidden comparison called a. simile b. metaphor c. alliteration d. personification

A hidden comparison is called B. metaphor.

If you say - Those two suns peered deep into my soul, where by suns you mean eyes, then it is a metaphor. A metaphor is comparison where you don't use words such as like, or as.

Simile uses words like or as: She runs fast like the wind

Alliteration is the repetition of the same consonant

Personification is when non-human entities have human qualities, such as: The cloud is crying