Please help me with this:( patulong plss

Which answer correctly lists the four main types of animal tissue?

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.

Working to improve the working conduit a factory is an example of