Here's a little hint!
Consider each fruit as a variable like x, y, z and form equations to solve them and find the value of x,y,z! Then perform the given arithmetic operation to find the correct answer.
By first, substituting each fruit with a,b,c,d
and solving the four equations we get the values of a, b, c and d as 4, 2, 2 and 6 respectively.
Therefore the final value of a+c-d+b would equal 2.