A Machine Gear Consists of 0

A machine gear consists of 0.13 kg of iron and 0.17 kg of copper.How much total heat is generated in the part if its temperature increases by 34 C°? (Specific heats of iron and copper are 450 and 390 J/kg⋅°C,respectively. )

A) 4,000 J
B) 4,200 J
C) 4,600 J
D) 2,000 J
E) ​2,300 J