Which of these is an example of a conclusion? (2 points) a
ring a bell inside a tank of water

b
listen to the sound produced by a drum

c
sound waves do not travel in a vacuum

d
speed of sound may depend on pressure

When looking at research about instructional strategies, make sure the research is a. from peer-reviewed studies. b. approved by state and federal government organizations. c. online and easily accessible. d. about the same topic you're interested in.