Select the most appropriate option to fill in blank number 4.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. cause.
Context: The sentence discusses the Tunguska explosion and states that the reason behind it is still debated, so the blank must refer to what triggered or caused the explosion.
Meaning of the words:
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commencement – means start, not appropriate here
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beginning – refers to the start of something, does not fit the context
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cause – the reason something happens; perfectly fits here
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stages – phases of a process, irrelevant in this context
Correct word: cause
Final Sentence: The cause of the explosion is still debated, but it is believed to have been caused by a meteor or comet.
Hence, the chosen option is correct.