net ionic equation problem?

i can't seem to get the right answer for this one:

The net ionic equation for the reaction of aluminum sulfate and sodium hydroxide contains which of the following species?
a)3Al3+(aq)
b)OH–(aq)
c)3OH–(aq)
d)2Al3+(aq)
e)3Al(OH)3(s)

ok i wrote out the forumla and balanced it:
al2(so4)3 + 6naoh ---- 3na2so4 + 2al(oh)3

the only insoluble salt is the 2al(oh)3, so i cross out the ones that are aq which left me with al3+ and 6oh with the insoluble salt on the other side. what am i doing wrong?
 
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