Please answer this question below asap. I’m stuck on it!

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.

Does this have a b c d option or no 

11m per

Is it  multiple choice