Which of the following statements is true? a. fusion splits atoms. b. uranium 235 is produced from fission. c. the heat from stars is created by fusion. d. enrico fermi created the first nuclear bomb.

Okay, so first of all: fission splits atoms, fusion joins them
so this means A isn't true
B isn't true because Uranium 235 is produced by combining atoms (aka fusion)
D isn't true because it was J Robert Oppenheimer

This leaves C, and it's true because the light and heat from stars is caused by the huge amounts of energy they let off when atoms combine inside them