The passage discusses the idea that sometimes predictions can be wrong. It initially mentions that some events cannot be foreseen, and now the passage is adding more context about instances where predictions based on signs have indeed gone wrong.
Moreover: Adds additional information that supports or builds on the previous idea. It fits because the sentence adds further context about predictions going wrong.
Hence, option (b) is the answer.
Therefore: Used to introduce a conclusion or result, which doesn't fit the context here as no conclusion is being drawn.
Nevertheless: Introduces a contrast or exception. It's incorrect here because the passage isn't showing a contradiction, just additional information.
However: Also introduces contrast. It could work but doesn't emphasize adding more information as "Moreover" does.
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