EF Workshop 2 Demand and Supply

I know it's not and ideal graph, but at least i tried)

So this is our question:

The market for petrol

(a) A rise in the cost of refining petrol _H_

(b) A fall in bus and train fares _B_

(c) A fall in the price of crude oil and an increase in the price of cars _E_

(d) A rise in tax on petrol and a reduction in tax on cars _A_

Explanations
(a) Rise in the cost of refining petrol causes the supply curve to shift left, it means less supply and the prices increase. So the demand will contract( Remember the supply decreases demand contracts)
(b) A fall in bus and train fares, causes the demand to increase, which means various amount of people will travel by bus/train rather than cars... These effects will shift the demand curve to right causing the supply curve to extend.(demand increases supply extends)
(c) A fall in the price of crude oil will shift the supply curve to right, because cheaper the crude oil more of it will be supplied. An increase in the price of cars, shifts the demand curve to left, higher the prices demand decreases(if it's elastic)
(d) A rise in tax for petrol causes the supply curve for petrol to shift left, because, tax on petrol will raise the cost of production... Reduction in tax on cars causes people to buy more cars, which shifts the demand curve to right.


If one of my answers are wrong, comment please)