First you need to know what a sentence fragment is and also what a complete subject and predict is. That should help you.
A.Bandwagon:covincing everybody to believe what he believes
Answer:
Instead, the post-drought seeds gave rise to plants that flowered earlier than those of the pre-drought seeds, even in the greenhouse, confirming that the shift in flowering time really was due to an underlying change in the plants' genetic program.
Explanation: