Chemistry question help

Mass = Mr x moles
Moles = Mass/Mr
Moles = 3.9/78 = 0.05 moles of benzene
The first reaction is 70% yield so you only get 70% of the moles
0.7 x 0.05 = 0.035 moles of the intermediate compound
The second reaction is 60% yield so you get 60% of the moles of the intermediate
0.6 x 0.035 = 0.021 moles of phenylamine
Again, mass = Mr x moles
mass = 93 x 0.021 = 1.953g phenylamine so the answer is A

1) work out the number of moles of benzene
2) you're told the percentage yields, use those to eventually work out the moles of phenylamine
3) work out mass of phenylamine