You are right. Study this page.
https://literarydevices.net/alliteration/
16. Each of the following contains examples of alliteration except
"Then somthing caught: a helping grain of sand." ***my answer
"The car broke free and scuttled smartly right over the road."
"A post shot up and cracked--a sharp clang."
"I sat back in my seat-belt and saw someone coming."
I am super confused about this...can someone explain it to me and check my answer???
2 answers
http://literarydevices.net/alliteration/