The loss of head at various pipe fittings is given by the expression $\frac{K{v}^2}{2g}$. If values of K were 0.40, 0.90, 1.5 and 2.2, then these would correspond respectively to

foot valve of pump, ${45}^0$ elbow, ${90}^0$ elbow and close return bend

${45}^0$ elbow, ${90}^0$ elbow, foot value of pump and close return bend

${90}^0$ elbow, foot value of pump, close return bend and ${45}^0$ elbow

foot value of pump, close return bend, ${45}^0$ elbow and ${90}^0$ elbow