The table gives the weights and masses of four objects on different planets. On which planet is the gravitational field strength greatest?
- Aweight $2.0\ \text{N}$, mass $20\ \text{kg}$
- Bweight $4.0\ \text{N}$, mass $30\ \text{kg}$
- Cweight $6.0\ \text{N}$, mass $40\ \text{kg}$
- Dweight $8.0\ \text{N}$, mass $50\ \text{kg}$