The original sentence is: "Although I don't usually like parties, I (said I would go) 16. _____, as I hadn't been to one in ages." The phrase "said I would go" indicates that the speaker accepted the invitation. We need to choose the most precise reporting verb from the given options. A. agreed: To consent to something or to say yes. This fits the context of accepting an invitation. B. confirmed: To state or show that something is definitely true or correct, or to make an arrangement or meeting certain. While one might confirm attendance, "agreed" is a more direct replacement for the initial acceptance. C. admitted: To confess to be true or to acknowledge, often implying reluctance or revealing something previously hidden. This does not fit the context of accepting an invitation. D. surrendered: To give up or yield. This is completely inappropriate for accepting an invitation. "Agreed" is the most suitable and precise verb to replace "said I would go" in this context, as it directly conveys the acceptance of the invitation. The completed sentence would be: "Although I don't usually like parties, I agreed, as I hadn't been to one in ages." The correct option is A.