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21. Variables that can change or alter the testing system: A. can happen by chance only. B. can happen by chance or by human activity. C. can happen as a result of causes that are impossible to determine.
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21. Variables that can change or alter the testing system:

A. can happen by chance only.
B. can happen by chance or by human activity.
C. can happen as a result of causes that are impossible to determine.
D. can happen by human activity only.

User Andrea Reginato
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Answer:

I believe the answer is D. can only happen by human activity only

Step-by-step explanation:

If it is wrong im sorry, I did my best

User Ghik
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