The figure below shows scale factor RU as a function of time over the age of the universe.Ignoring the presence of dark energy,which curve would represent a plausible open universe? 
Definitions:
Increased Value
The appreciation or rise in the worth of an asset or investment over a period of time.
Variance
A measure of the spread between numbers in a data set, indicating how much the numbers differ from the mean.
Arithmetic Average
A statistical measure of central tendency calculated by summing a set of values and dividing by the number of values in the set.
Geometric Average
A method of calculating the average rate of return that accounts for compounding, commonly used for investment portfolios.
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