Read the passage, then explain the connection between reading the text and watching the video.

"NGC 5128 (Also known as Centaurus A)

Type: Supermassive

Importance: The black hole in the center of our nearest active galaxy

Location: About 14 million light years away, in the constellation Centaurus

Cool fact: At 200 million times the mass of the Sun, this black hole is far more massive than Sagittarius A*."

please dont give sample

What is the difference between an observational study and an​ experiment? choose the correct answer below. a. in an​ experiment, a treatment is applied to part of a population and responses are observed. in an observational​ study, a researcher measures characteristics of interest of a part of a population but does not change existing conditions. b. in an​ experiment, a treatment is applied to an entire population and responses are observed. in an observational​ study, a researcher measures characteristics of interest of an entire population but does not change existing conditions. c. in an​ experiment, a researcher measures characteristics of interest of a part of a population but does not change existing conditions. in an observational​ study, a treatment is applied to part of a population and responses are observed. d. in an​ experiment, a researcher measures characteristics of interest of an entire population but does not change existing conditions. in an observational​ study, a treatment is applied to an entire population and responses are observed.