Hey there!
When plants grow towards the sunlight they get more light.
This is because the sun gives light. It wouldn't be "C" because sunlight makes plants survive, it wouldn't be "A" because sunlight doesn't decrease the size, and it wouldn't be "D" because the sunlight only makes it survive, not actually live longer. This means your answer is option B: they get more light.
Hope this helps
Have a great day (:
