Ais an example of a longitudinal wave

hfjfhjf fhjf ffhi is that a really good night for me that i would love ya ya i know i love ya ya know ya i know you got it but i don’t know what i was you’re your friend you didn’t even know that i had it rand right now i don’t have time for that to get to know that i’m not even a big fan ii this was my first time in the morning

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.