A scientist wants to know how individual lions within a pride interact with each other in their own environment. To do this, the scientist sedates and tags all of the lions within a pride. Then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. He collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.

This example shows that
A.
conditions and variables are best controlled in observational field studies.
B.
observational field studies are not a valid form of scientific investigation.
C.
not all scientific knowledge is gained through controlled laboratory experiments.
D.
there is only one way to acquire scientific knowledge.