What is the best way to combine the sentences labeled (4) and (5) in order to achieve smooth coordination of these two short, choppy sentences? a) when there were only 110 people in the race, the race began modestly in 1970. b) the race began modestly in 1970 when there were only 110 people in the race. c) the race began modestly in 1970, and back then in the race there were only 110 people in it. d) while there were only 110 people in the first race, the race still had a modest beginning in 1970.