What does this code do?

Code:
@media only screen and (max-width: 768px) {
    class*="col-"] {
        width: 100%;
    }
}

A. Scaled Vector Graph B. Scalable Vector Graphics C. Scaled Vector Graphics D. None of the mentioned

A. cx B. cy C. rr D. ry

A. x B. y C. x1 D. all of the mentioned

A. text B. stroke C. line D. all of the mentioned