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taylorswift13 thank you so much you are the most amazing person to ever exist

this is probably a really easy question but its confusing me so much and google nor my teacher gives me a proper and reliable explanation

"A chocolate bar weighed 250 g. If its dimensions were increased by a factor of 4, how much would it weigh?
a) 1000g
b) 2000g
c) 3000g
d) 4000g
e) 16 000g"

the answer is d) 4000g but im confused as to how this was achieved