DETROIT—General Motors Co will begin deliveries of its GMC Hummer electric pickup truck in December, the brand’s chief said on Tuesday. The top-of-the-line “Edition 1” of the Hummer will have an electric driving range of 329 miles, Duncan Aldred told reporters on a conference call. GM is launching the vehicle with that model, with a starting price above $100,000, and subsequent models, with higher EV driving ranges and lower starting prices, will be added in 2023, he said. Aldred said more than 80 percent of the reservations for the Hummer pickup were for the Edition 1 model and nearly half of the more than 125,000 people who have expressed interest in the Hummer have put down $100 to reserve the truck. The Hummer EV will join the electric pickup made by Rivian Automotive Inc in the market. Ford Motor Co will introduce its electric F150 Lightning next year. Tesla is …