已知：Fe(s)＋O₂(g)==="FeO(s)" ΔH₁＝－272 kJ/mol
2Al(s)＋O₂(g)===Al₂O₃(s)ΔH₂＝－1 675 kJ/mol
则2Al(s)＋3FeO(s)===Al₂O₃(s)＋3Fe(s)的ΔH是

A．859 kJ/mol	B．－859 kJ/mol
C．－1403 kJ/mol	D．－2491 kJ/mol