If the proposition 'Some fishes are not egg-laying animals' is given as true, then which of the following propositions could be immediately inferred to be false?

All fishes are egg-laying animals must be false when the O proposition is true.

The given statement Some fishes are not egg-laying animals is a particular negative O.

The contradictory of an O proposition is the universal affirmative A, All fishes are egg-laying animals.

Contradictories cannot share a truth value, so a true O forces its A to be false.

This is read straight off the square of opposition.