A balloon filled with air is weighed(W) so that it just floats in water as shown in the figure. When it is further pushed by a short distance in water, it will.

Come back to its original position

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Stay at the depth where it stands submerged

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Sink to the bottom

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Sink down a little further but will not reach the bottom

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Solution

The correct option is B Come back to its original position
Assuming that "barely able to float" means that it still IS able to float, then it's density is still less than water's and it will return to the surface after being pushed below the surface.
However, if by "barely able to float" the questions means that the weighted balloon's density is the same as water's, then it will not return to the surface of the water; it will just continue to float at the depth.
Hence Option A is correct.

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