If an economy has capital that is less than the golden rule level of capital, can we reach the golden rule without increasing the savings rate?
Yes the answer should be C. I have attached an image showing the variation with time of the variables $y$(per capita output), $c$(per capita consumption) and $i$(per capita investment). I am assuming at $t=t_0$ the savings rate is increased. 

The consumption per capita initially will fall because the savings rate has increased. Eventually it must go above the initial per capita consumption because of the Golden Rule condition.

Cheers!