The problem is about the basic property of fractions, namely, multiplying or dividing the numerator and denominator by the same number (except $$0$$), the value of the fraction is unchanged. 
The fraction $$\frac23$$ keeps the same value when both its numerator and denominator are． 
Options:
[A] multiplied by $$2~ $$ 
[B] increased by $$2$$ 
[C] decreased by $$2$$ 
[D] $$ $$squared$$ $$ 