A child releases a helium-filled party balloon. It is filled with low-quality helium so that the net specific gravity (compared to ambient air) is 0.15, including a small allowance for the the light balloon shell. Its initial acceleration opposite to gravity starting from rest is about: (Hint: Since the body is starting from rest, you can ignore drag to get the initial acceleration, but you must include buoyancy forces)
A. -17/13g
B. -1g
C. -25/13g