Final answer:
The demand factor for a single family dwelling with a general load of 35,000 kVA using the optional technique is 3,500.
Step-by-step explanation:
The demand factor is used to adjust the current based on the general load of the single family dwelling. In this case, the general load is 35,000 kVA. To calculate the demand factor, we divide the general load by the optional technique, which is 10 kVA. So, the demand factor is 35,000 kVA / 10 kVA = 3,500.