A. For time, with a partner, row 10 km for time. Alternate every 500 m. This is loosely inspired by the marathon row in the recent CrossFit Games. A marathon is 42.2 km. Each.
There are some workouts where you just have buckle down, go at a reasonable pace, try to be as efficient as possible with your technique, and put in the work. This is not a sprint. You will need to pace this one out.