Answer:
A. First; But later
Step-by-step explanation:
The correct option is Option A. It best clarifies the sequence of events in this narrative.
Looking at the given narrative, the narrator reveals their experience on their way for a picnic. So, the narrator first revealed the state of the river and how they finally struggled to get afloat.
But something happened later after they got afloat. The buzzing of the bee that made the sister scared and jumped out of the canoe made them to tip over the boat into the water. What happened after they finally got afloat again made the narrator to use "But later".