Read the excerpt from "Pilgrim at Tinker Creek." The sharks disappeared as each wave rolled toward me, then a new wave would swell above the horizon, containing in it, like scorpions in amber, sharks that roiled and heaved

Which answer best describes how the word roiled affects this excerpt?

It illustrates that the sharks are swaying gently.

It shows that the sharks are swimming in unison.

It demonstrates that the sharks are wiggling playfully in the water.

It suggests that the sharks are moving violently.​