How to calculate normal force.

Ithink it is letter b, i may be wrong but i think that is the answer

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.

They like garbage and they hunt during the night.