Which sentence best shows the correct comma usage? A. I wanted to add by the way, that I went to visit the Washington Monument in Washington, D.C. over the weekend. B. I wanted to add, by the way that I went to visit, the Washington Monument in Washington, D.C. over the weekend. C. I wanted to add, by the way, that I went to visit the Washington Monument in Washington, D.C. over the weekend. D. I, wanted to add by the way, that I went to visit the Washington Monument in Washington, D.C. over the weekend.