Which of the following is a practical example of gravity acting on an object

Hey y'all! just a quick question! i am studying german, again. and i need some ideas to rememer the materials and be able to speak it.

Which verb form best completes the conversation? caroline: was hast du gekauft? laura: ich habe ein waterbuck gekauft. es hat zwanzig euro a. bekommen b. geflogen c. bezahlt d. gekostet

Knowing when to use less and fewer is often something people find difficult which of these sentence is wrong