The plot of "The Signalman" reaches a climax when signalman dies. As you know, the main characteristic of climax is that it is the most emotional part of a story that provides a lot of interest and suspense to a reader. The death of signalman is the highest point of emotional intensity of the plot as the loved protagonist unexpectedly (or undesirably) passes away and put an end to the story.
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The answers are A and D aka
A: Something has come into our community, which is strong enough to save our community; but which has not yet got a name.
D: But it is not true; and we must not concede it to them for a moment.
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