Is this statement " Mommy made me mash my m&m's," an alliteration?

What is alliteration?

Which of the following is an example of an alliteration?: (A) Splendid Sarah saw special shells. (B) Lucy jumps at least a hundred feet in the air. (C) The sky is blue and so are you

"Betty Botter bought some ....., but she said, the ......'s bitter; if I put it in my batter it will make my batter bitter, but a bit of better....... will make my batter better.

Greg grabbed the garnish from the graceful bowl.

Becky's beagle barked and bayed, becoming bothersome for Billy.

The wind whistled through the willows.

Tommy tried to twist, but tumbled.

Constance catered to her cat with catnip to keep it from kidnapping canaries.

" Three grey ...... in a green field grazing, grey were the .... and green was the grazing"

Snakes slither on the sidewalk. What words are an alliteration?

Is the statement "She sang like a bird", an alliteration?