Read these sentences.
Park rangers learned fires are needed for sequoias to thrive. Fires clean the forest floor and make room for new growth. Sequoias need sunlight, and fires clear small plants that shade the sprouting trees.
What transition should be added at the beginning of the second sentence?
A.
On the other hand,
B.
Most important,
C.
Therefore,
D.
Instead,
A.
On the other hand,