The most reliable way to make good observations is to .
A. make inferences as you observe
B. pay careful attention to what you are observing
C. draw a line through anything you need to change
D. set up a data table after you've made your observations

B--- pay careful attention to what you are observing.

Explanation:

When you go to fast when making observations, you can mess up. When you take your time and pay careful attention when making observations, there is a chance you could mess up, but it is very slim.

the cell theory states that all living things including animals, as well as plants, are made of cells.

this protocol describes a detailed procedure for intracellular flow cytometry staining.