How would this sentence be edited to using transitional words as a sentence opener? “Many people were left without power for 48 hours.”

A. Frighteningly, many people were left without power for 48 hours.
B. As a result, many people were left without power for 48 hours.
C. In rural areas, many people were left without power for 48 hours.
D. No change needs to be made to this sentence.