Read the passage from "pilgrim at tinker hill"

as each green wave rose from the churning water, it illuminated within itself the six- or eight- foot- long bodies of twisting sharks.
a. dangerous
b. beautiful
c. moving
d. dark

I just took the test, it's A. Dangerous

i guess the cause and effect would show how being around the smoke(the cause) can have negative effects on the body.

explanation:

martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.