NaOH is added to buffer(pH=4.4). How will pH of buffer be

A buffer consisting of equal amounts of a weak acid and its conjugate base has a pH of 4.4. A small amount of NaOH was added to this buffer solution. How will this affect the pH of the buffer?
A. It will increase by more than 1 pH unit.
B. It will decrease by more than 1 pH unit.
C. It will stay roughly the same.
D. It depends on the pKa of the weak acid of the buffer solution