Based on the context of this sentence, what is the meaning of the capitalized word?
the scientist prepared the medium in witch she would grow the the bacteria
a) middle size or degree
b) form of communication
c) substance for conducting electricty
d) envoronment in which things grow

Read the sentence from the war of the worlds. i turned, and as i did so the screw must have come out, for the lid of the cylinder fell upon the gravel with a ringing concussion. which option is the accurate synonym of the word concussion as it is used in the sentence? explosion disruption crash interruption