Give odd one out  with reason:
Wood,cork,iron nail , paper
Upthrust , buoyant force , pressure , upward force
Ship , boat , submarine , aeroplane 

Dear Student ,
(a) iron nail , as  iron nail is not made from wood or material of wood .
(b) Pressure as , all other are forces acting upwards .
(c) Aeroplane , as aeroplane moves in air and others move in water .

Regards