Which bear cub is growing faster and by how much?

Responses
A Mish is growing faster by four pounds per week.Mish is growing faster by four pounds per week.
B Mish is growing faster by one pound per week.Mish is growing faster by one pound per week.
C Mash is growing faster by three pounds per week.Mash is growing faster by three pounds per week.
D Mash is growing faster by two pounds per week.Mash is growing faster by two pounds per week.

The bear cub that is growing faster is A) Mish, growing faster by four pounds per week.