Which one could be the three confounding variables?

[yasmin21]

biology urgent need help?

An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is:
“There will be a large difference between the number of insect in a dark side and the number in a bright side of the chamber.”
Which one could be the three confounding variables?

A - Varying humidity across the chamber
B - The orientation of the chamber
C - The age of the insects
D - The non-reflective material from which the chamber is made
E - The type of light source used
F - Varying temperature across the chamber

I was thinking A, E and F but there is something wrong even A,B and C is wrong
Any help would be appreciated. Thanks
can someone tell me which one is correct please

 

[Qube]

Is there one correct answer or are there multiple correct answers?

I think there are justifications for all the answer choices.

But first, what is a definition of a confounding variable, in your own words?

 

[yasmin21]

no i just need you to choose three confounding variables from the list please.
A confounding variable that should be kept constant/ controlled.

 

[phinds]

no i just need you to choose three confounding variables from the list please.
A confounding variable that should be kept constant/ controlled.

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