What type of wound occurs when the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of skin?
a-abrasion b-avulsion c-laceration d-puncture

When the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of skin, this is called an "A. abrasion". Lacerations affect deeper tissue layers.

A, Abrasion. An avulsion would be when the flesh is basically torn away, as if someone took a spoon and removed flesh. A laceration would be a large cut, such as a wound inflicted by a knife. Puncture wounds would be when something punctures the skin, i. e., I stepped on a nail, giving me a puncture wound.