What did the tin man say when he got run over by a steamroller?

Morning guys i got some questions for ya heading your way answer !

Firms use marginal analysis to determine prices by a) changing prices in accordance with information from retailers. b) using comparisons with strong competitors to position prices accordingly. c) examining the effect on revenue of small changes to the price of one item. d) trying to minimize production costs by using better and more efficient methods.

If you walk up stairs,how u gonna pet yo dog? if you go to colloge,how you gonna fly? if you like school how u gonna be a person?