What conclusion can be drawn from the author's description of how thomas edison told nikola tesla, "spare me that nonsense," when tesla argued that ac generators would work better than dc generators in "nikola tesla, inventor"?
a. edison had not yet invented the electric light bulb at this point.
b. tesla was quite jealous of edison's fame and wealth.
c. edison could be very stubborn and difficult to work with.
d. tesla was speaking about something he did not understand.

Read the following excerpt from "the city without us" by alan weisman: almost every other compound in nature contracts when frozen, but h20 (water) molecules do the opposite, organizing themselves into elegant hexagonal crystals that take up about 9 percent more space than they did when sloshing around in a liquid state. pretty six-sided crystals suggest snowflakes so gossamer it's hard to conceive of them pushing apart slabs of sidewalk. which statement best describes the effect of the metaphor on the excerpt's meaning? o a. it likens h2o molecules to hexagonal crystals, which are actually larger than people imagine. o b. it makes the frozen crystals seem like friends to the city to contrast with what a deceitful foe they are. o c. it compares the sloshing liquid to a river of water able to push apart the sidewalk o d. it compares the frozen crystals to delicately lacy snowflakes having an unexpected strength (apex)