Fr points everyone come and get em

What process is believed to be responsible for the formation of the grand canyon? a) diverging tectonic plates b) converging tectonic plates c) erosion over a long period of time d) caving in of the ground due to erosion

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.

With my drivers ed ill mark you brainliest can someone correct me if i’m wrong or confirm if i’m right? i think the answer is d to move forward in an automatic transmission vehicle, shift to a. park b. reverse c. neutral d. drive