Question

the root rupt means break or burst. what does the word erupt mean? to stop suddenly to change direction suddenly to burst forth suddenly

Explanation:

The root "rupt" means break or burst. The prefix "e-" (or "ex-") in "erupt" means out. So combining the root and prefix, "erupt" should mean to burst out or forth suddenly. Among the options, "to burst forth suddenly" matches this meaning. The other options ("to stop suddenly", "to change direction suddenly") don't relate to the meaning of the root "rupt" (break/burst) and the prefix "e-".

Answer:

to burst forth suddenly