Due to the intense heat and pressure on the inner core, scientists believe it is a solid liquid semi-fluid gas

The core of the earth is made out of iron and nickle and because of the heat it is LIQUID.

The outer core of the Earth is a liquid layer about 2,260 kilometers thick. It is made of iron and nickel. This is above the Earth's solid inner core and below the mantle. Its outer boundary is 2,890 km (1,800 mi) beneath the Earth's surface.(this is from google)

answer; i believe that the correct answer is(d) nondisjunction during meiosis;

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.