Question on charge density. please help

65 In the figure shown a long line charge of linear charge density 2, is lying along the axis ofa unifomly charged ring of same linear charge density 2.One end of the line charge is at the centre of the ring. Electric force between the two is ++++t++++ +++++ 2 ()Eo (d) Eo (b) 4 Eo (a) 20