Which of the following sentences is correctly punctuated?
A. In short, we wish to congratulate Keisha, Marius, and Jayma for making this presentation so interesting and informative.
B. I love to attend yoga class, ashtanga style yoga is my favorite.
C. Alex enjoys cooking his family and, his dog
D. On the hillside Sung-ho saw his sister mother and father.
This sentence uses commas correctly to separate items in a list (Keisha, Marius, and Jayma) and sets off the introductory phrase "In short" with a comma.
Therefore, the Correct Answer is A.