I would think that it would be A.... I am an expert but, only in 8th, so I would double check.
31/40
replace 77.5 with 775/10
simplify to get 155/2
divide by 100 to get 31/40
E+14 is 100000000000000, so 1.783864 times that is 178386400000000
Someone is answering good luck