Step-by-step explanation:
Melting is defined as a change in which a solid changes into liquid state.
For example, an ice cube will melt at room temperature whereas a large ice block will also melt at room temperature.
Therefore, sample A melts at the same temperature as sample B.
Since sample A is small in size whereas sample B is larger in size. Hence, sample B has a larger mass than sample A. Also, sample A has smaller volume than sample B.
On the other hand, floating ability of a substance depends on its density. Therefore, being sample of same substance if sample A floats in water then sample B will also float in water.
Also, it is given that sample B is attracted to a magnet therefore, sample A will also be attracted to a magnet.