Which option best revises the paragraph to convey the same meaning while maintaining a formal tone throughout?
Long before the refrigerator was invented, people prevented food from
spoiling by drying it with the sun's heat. This process enabled food to
be stored and consumed during the cold winter months when food
was scarce. A bunch of years later, people figured out how to put food
in cans, and that meant that it would be good to eat for even longer.
A. Long before the refrigerator was invented, people prevented food
from spoiling by drying it with the sun's heat. Once food was dried
out like this it would last for a while and you could even eat
something in the winter that you had found way back in the
summer. Then, a bunch of years later, people figured out how to
put food in cans to keep it good.
B. Way back when people didn't understand about using refrigerators

it is believed to be alfred, lord himself

21 balloons is the story of professor william sherman's travels.

in 1883, he set off from san francisco for a balloon ride over the pacific and was found a month later floating with 21 balloons in the atlantic ocean. this seemed an astounding feat and everyone wanted to know what had happened.    

professor sherman was loyal, however, and said he would tell his tale first to the western american explorers club in san francisco, of which he was a member. this built up suspense for several chapters before he began to tell of the wonders of his adventures and the amazing island of krakatoa, an island which had just been blown up by a volcano.  

the residents of krakatoa are all millionaires who live under a "gourmet government" of their own devising. we get to see all the incredible adventures that creative people with unlimited resources would create according to the author.

the question is the text structure of this passage is. a. chronological order. b. problem and solution. c. cause and effect. d. compare and contrast.