Which of the words below would be a good replacement for the bold word--to match the tone of the sentence? Our eyes were seared by the sudden light when the fire reached the stash of gunpowder.
flame a
spark b
explosion c
brightness d

Ivansanger rainsfordgeneral zaroffwhitneyadventurous hunter; calm and composed; considers himself a realist; new yorker; veteran of world war ia hunter; sympathetic to the plight of voiceless, defenseless animals; cautiouscossack; mute; formidable physical stature; wears a black uniform; used to whip prisoners for the great white czarcossack; aristocrat; has sharp, pointed teeth and red lips; devoid of humanity and emotion