In a circuit connecting only lighting points, the maximum load that can be connected is determined by the current rating of the circuit and the wattage of each lighting point.

1. Current rating of the circuit:
The current rating of a circuit is determined by the rating of the protective device, such as a fuse or a circuit breaker. This rating is usually specified in amperes (A). To calculate the maximum load that can be connected, we need to know the current rating of the circuit.

2. Wattage of each lighting point:
The wattage of each lighting point refers to the power consumption of the light bulbs or fixtures that are connected to the circuit. This wattage is usually specified in watts (W). To calculate the maximum load that can be connected, we need to know the wattage of each lighting point.

3. Calculation:
To determine the maximum load that can be connected in the circuit, we can use the formula:

Maximum Load (in watts) = Current Rating (in amperes) x Voltage (in volts)

Since the voltage is not given in the question, we can assume a standard voltage of 120 volts for residential lighting circuits.

Let's consider the options given in the question:

a) 500 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.

b) 750 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.

c) 800 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.

d) 1000 watts: This option does not provide any information about the current rating of the circuit, so we cannot determine if it is the correct answer.

Since none of the options provide the necessary information to calculate the maximum load, we cannot determine the correct answer based on the given options.