Which phrase includes alliteration?

a. her laugh was a hyena's cry.

b. live, laugh, and love your fellow man.

c. love is a rose.

d. life is full of great surprises and unimaginable treats?

Alliteration is when there are two words that connect eachother and start with the same letter, usually at the start of a sentence.

For example;
Leaping lizard
Negative Nancy
Sad Sally

Let's look at A.)
"Her laugh was a hyena's cry."

This is a metaphor, as you're comparing two unlike things (Her laugh and a hyena's cry).

Let's look at B.)
"Live, laugh and love your fellow man."
This is an example of alliteration, as it meets the requirements.

B.) is your answer, I hope this helps!