We have that Microorganisms and Multicellular organisms an cause a contagious disease
Hence
Option D is Correct
From the question we are told
Which organisms can cause a contagious disease
A. neither
B. microorganisms
C multicellular organisms
D. both
Generally
These ere organism that needs a microscope to be seen and cannot be seen with the naked eyes
This are organism that are made up of multiply cell and there also Microorganisms
Therefore
Microorganisms and Multicellular organisms an cause a contagious disease
Hence
Option D is Correct
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