Rust is an iron oxide and formed by the reaction of iron and oxygen in the presence of moisture. So the answer would be C
Electron, because they’re about 1/2000 the mass of a proton or nuetron
E=hc/λ =6.626×10^-34×3 ×10^8 / 3×10^7 × 10^-9 = 6.626×10 ^-24J.
