SIOUX FALLS, S.D.—South Carolina shot 46.7 percent from the field and made quick work of South Dakota on Friday night at the Mammoth Sports Construction Invitational, but it was the stingy defensive effort that led the No. 1 Gamecocks to a 72–41 win over South Dakota. Destanni Henderson scored 15 points, including 4 3-pointers for the Gamecocks. South Carolina’s defense limited South Dakota to just 25.4 percent from the field. “We’re probably a far better defensive team at this stage of the game,” Dawn Staley said. “I think we did a really good job of making them second-guess, or making them play a little bit faster than what they wanted to play. We just imposed our defensive will on them.” The Gamecocks (2–0) built a quick 10–0 lead, and South Dakota didn’t get its first field goal until Liv Korngable scored with just under three minutes to play in the …