The correct answer is option C: The more / the higher.

Explanation:
Electricity usage and bills are directly related. The more electricity you use, the higher your bill will be. This is because the amount of electricity consumed determines the amount you are charged for.

1. Electricity usage:
- The more electricity you use, the higher your electricity bill will be. This is because utility companies charge customers based on the amount of electricity consumed.
- Electricity usage is typically measured in kilowatt-hours (kWh). The more devices you have running, the longer they are on, or the higher their power consumption, the more electricity you will use.

2. Billing:
- Utility companies calculate your electricity bill based on the number of kilowatt-hours you consume during a billing cycle. They multiply the number of kilowatt-hours by the applicable rate per kilowatt-hour (which varies by location and utility company).
- The more electricity you use, the higher the number of kilowatt-hours, and therefore, the higher your bill will be.

Example:
Let's consider an example to illustrate this relationship:
- If you use 500 kWh of electricity in a month and the rate is $0.10 per kWh, your bill would be $50 (500 kWh * $0.10/kWh).
- If you increase your electricity usage to 1000 kWh in the same month, your bill would double to $100 (1000 kWh * $0.10/kWh).

Conclusion:
In conclusion, the more electricity you use, the higher your bill will be. This is because utility companies charge based on the amount of electricity consumed, and the billing is directly proportional to the number of kilowatt-hours used.