Question

A. Cells are the basic unit of all living things.

Answer 1

Your answer is A, (because indeed it is the basic unit of even LIFE), B, (because MOST cells are used for ANY part of the body functions, which makes it unique and some have special features for specific jobs in da body), and D, (because of all of the built in parts of the cell that makes it function, like its mitochondria, etc.).

I hope I helped! =D
                                                                    -Brainiac01
P.S.,
If it's only ONCE answer choice, your answer would be A., because that is a fact STRAIGHT from Science. ;-)

Answer 2

The answer is The basic unit of life