Using all three parts of the cell theory explain why something would be considered living

The cell theory is an explanation of what cells are and why they exist.  The three main parts are:  1) All living things are made of cells and their products,  2) New cells are created by old cells dividing into two, and  3) Cells are the basic building units of life.  In 1665, Robert Hooke observed, with the aid of a crude compound microsope, the structure of a thin slice of cork.  The structure resembled stacks of hat boxes, or holding cells, so he called what he observed "cells".  In 1674, Anton von Leeuenhoek observed, in a sample of pond water, small animal-like creatures swimming around.  He probably was looking at Spyrogira, but he called these small organisms "animal-cules".  Theodore Schwann and Matthias Schleiden are responsible for formulating the first two parts of the cell theory, which was a scientific explanation of what these scientists had observed up to this point.  A few years later, Rudolph Virchow added the third part of the cell theory, that all things are composed of these basic building blocks called cells.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

Ithink it’s c or b for the answer.