PLSSS HELPP FOR 150 POINTS NO JOKE CAN EVEN SEND U 50 MORE IF U HELP

the only one that looks like it could be the answer is B

the reason why I say the only answer it can be, is answer Choice B is because when I see a fraction like that, my mind automatically goes to division, so -1 divided by 2

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents