This is unrealistic because matter is needed to transmit sound waves and is therefore denoted as option B.
This is defined as a disturbance that travels through a medium with an accompanying transfer of energy.
Light waves don't require materials for its propagation which is why it can travel through a vacuum. However sound waves require materials and can't travel in a vacuum.
This is therefore it is unrealistic for a large explosion to be heard in space which is a form of vacuum and is therefore the most appropriate choice.
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