Question

what are constants?
variables (parts of the experiment) made different for each group
variables (parts of the experiment) kept the same across groups
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Explanation:

In experimental design (a concept often studied in fields like Natural Science, especially in scientific method - related subfields like Biology, Physics, etc.), constants are the parts of an experiment that are kept the same across different groups (or experimental conditions). The first option describes variables that are manipulated (independent variables), while the second option correctly defines constants.

Answer:

The option with the text "Variables (parts of the experiment) kept the same across groups" (you can represent it with the checkbox associated with this option, but since we need to present it as per the multiple - choice answer format, if we assume the second option is, say, Option B, then: B. Variables (parts of the experiment) kept the same across groups)