To understand an unknown words meaning a student should
a. use context clues
b. determine the words part of speech
c. study the word affixes
d. all of the choices are correct

D. All of the choices are correct.

Explanation:

To find out what an unknown word means you could use context clues, look at how the word is being used, and you can study the words affixes.

the answer is something i don't know

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.