What type of flame is completely eliminated by using electronic ignition?

The correct response describes the type of flame that electronic ignition technology effectively removes from operation—specifically, the pilot flame. In traditional gas appliances, a pilot flame is a small flame used to ignite the fuel being used by the appliance.

When electronic ignition systems are employed, the need for a continuously burning pilot flame is eliminated. Instead, these systems ignite the gas at the time of use, benefiting efficiency since there is no constant burning flame. The absence of a pilot flame leads to reduced gas consumption and enhanced safety, as there is no risk of the pilot flame being blown out, which could lead to gas leaks.

In contrast to a pilot flame, the other types of flames mentioned—blue and yellow flames—can still occur when there's a gas supply, and open flames could still be present in various contexts even with electronic ignition systems in place, as they do not pertain directly to the electronic ignition abolition of pilot flames.