Can you help me with these please .

1) When the price was first set at $1.79, there was a ( equilibrium/ scarcity/ shortage/ surplus)of hula-hoops on the market.

2) After a while, what starts happening to the price of hula-hoops on the market and why? which one will be the right one ?

a.the price starts to fall due to the market forces of supply and demand. b.the price starts to fall because the price of plastic becomes cheaper

c.the price starts to rise because of the market forces of supply and demand. d.the price starts to rise because the price of plastic becomes more expensive.

link :

https://vimeo.com/194568795