The italicized word (magnitude) in the sentence can best be matched by the word: size. This is referring to the size of the disaster, that it is hard to imagine something happening on that size scale.
B. would be the answer hope it works.
D. subject
The subject is usually located in the beginning of the sentence.
<span>What happens is when you shorten "refrigerator" to the one-syllable "fridge" you move the "g" from the beginning of a syllable (re-fri-ger) to the END of one. </span>