I just have a few questions that I'm probably looking at in a weird way but if you could please help me out I'd appreciate it.
1) When the demand the supply grow larger for a product, why does the price go up on a graph? I thought in theory that if you have increased demand and supply to meet a new equilibrium, the price will drop.
e.g. With the picture below, the quantity demanded goes from 100 to 150 so the supply goes up. With this increase demand, why does the price go up? Even though I don't believe it in my head, in theory, if a product experiences increased demand and it can meet that demand, the price will go down and vice versa?

2) I'm doing some homework and I've experienced a few questions that I find weird.
e.g. Which of the following would be most likely to cause a shift from S
1 to S
2? (It also has a basic graph that shows that supply goes left (increase) from S1 to S2).
a) a decrease in taxes paid by the industry
b) a removal of government subsides to that industry
c) a reduction in transport and freight charges
d) a decrease in the cost of raw materials
I personally chose D but couldn't it really be any of those?