none of the answers are correct...
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An independent variable is a variable that is not affected by the experiment or the function. It is normally time because time passes regardless of any experiment.
Time, which affects everything (even if it seems to affect it very slowly).
Your question seems to be based on a scenario which you need to explain
Frankincense and myrrh were both grown in inhospitable areas of southern Arabia.
I cannot say about "lenght", but distance is a measure of length so length affects distance. Speed is the rate of change of distance (over time) so length affects speed. Mass does not significantly affect speed or distance but, because they are affected by acceleration and acceleration is affected by mass (for a given force), then mass affects them. Also, mass affects space time and the presence or absence of mass changes the lines along which distances are measured and so distances and speed are affected.