Three of the statements are true. 'D' is false.
Glass and rubber are excellent insulators, total duds as conductors.
Melting
we know that ice melts at 0 ⁰C. in the graph, at position B, the temperature is constant, which indicates that phase change is taking place there. at B , from the graph , we also notice that the temperature is constant at value 0 ⁰C. this indicates that ice at 0 ⁰C is converting to water at 0 ⁰C there at position B in the graph.
hence the correct choice is Melting.
If you give us the situation described then I'll be able to help.
Well,
When an object's velocity changes, we call it acceleration.
Acceleration: The time rate of change in an object's velocity
