Answer:
D. Pavel wakes up in his bed and realizes he was just having a nightmare.
Step-by-step explanation:
According to the given passage, Pavel, a nuclear engineer discovers that the temperature of the reactor core keeps rising and he cannot seem to get it to cool down no matter what.
Therefore, the ending to this story that is most clearly an anticlimax is option D.. This is because it has a disappointing end to the frantic and exciting beginning.
P. S An anticlimax is a figure of speech that shows a series of events in a descending order of importance, from exciting to disappointing.