Ineed some with some history questions

1.what made mustard gas for effective?
a. it was effective in stopping air attacks
b. it didn't need to be inhaled to be effective
c. it was colorless
d. it caused instant death rates

2.why did people inside of tanks often pass out?

a. they had very little training

b. it was so fast

c. they were terrifed
d. it was very hot and there was nothing seperated them from engines and fumes

Why would southern delegates to the constitutional convention have opposed the three-fifths compromise? a) they feared that the president would eventually become "king" in the united states. b) they believed it would be insufficient in protecting the united states from invasion. c) they opposed the creation of a congress that would give states an equal number of senators. d) they wanted their full population of slaves to be counted for purposed of congressional representation.