Please please please I need someone who knows mathematics and someone who knows biology and someone who knows physics, very, very necessary

No because a circle or pie graph usually shows percentages you'd need a line graph

The best answer i can think of is b

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.