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.