Your answer is B - The eruption is explosive.
The correct answer is D. The nucleus transcribes and releases messenger RNA signalling for the enzymes to be synthesized.
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The nucleus is the site of transcription, production of messenger RNA (mRNA). Because of that, it contains a lot of proteins that either directly are involved in transcription or are involved in regulation. mRNA is exported from the nucleus, after being post-transcriptional modified.</span>