Three positions shown describe: (a) the magnet's entry (b) magnet is completely inside (c) magnet's exit
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When a bar magnet is entering with constant speed. flux will change and e.m.f. is induced, so the galvanometer will deflect in a positive direction.
When the magnet is completely inside, the flux will not change, so the reading of the galvanometer will be zero.
When the bar magnet is making on exit, again flux will change and on e.m.f. is induced in opposite direction to not of (a), so galvanometer will deflect in a negative direction.
So the answer is