Which equation is correctly balanced: #A.# #Al(s) + 3O_2(g) rarr Al_2O_3(s);# #B.# #Al(s) + 3O_2(g) rarr Al_2O_3(s);# #C.# #Al(s) + 3/2O_2(g) rarr Al_2O_3(s);# #D.# #2Al(s) + 3O_2(g) rarr 2Al_2O_3(s)?#