Concept:Convert each term to its numerical value, then add them together.Explanation:12 thousand = 12,000.13 hundred = 1,300.2 tens = 20.Now add: 12,000 + 1,300 = 13,300.Then add 20: 13,300 + 20 = 13,320.Answer:Thus, the sum is 13,320, which matches option C.