Which of the following statements are correct?

i) An increase in the price of a product will cause the demand curve of a substitute product to shift to the left.

ii) If a producer manufactures a unit elastic product, he/she cannot influence total revenue by changing the price.

iii) Frictional unemployment occurs when people are between jobs.

iv) The elasticity of products changes over time.

v) If products X and Y are complimentary an increase in X's price will lead to an increase in demand for Y

A. i,iii,v

B i,ii,iii,v

C i,iii

D ii, iv, v

E ii, iii, iv