Move the correct word to complete the paragraph. Tomato plants with [ ] stems have a higher survival rate...

Move the correct word to complete the paragraph.
Tomato plants with [ ] stems have a higher survival rate in a bright environment. In contrast, tomato plants with [ ] stems have a lower survival rate. This pattern shows that the survival of tomato plants in varying light conditions depends on [ ].
Options: stem length, sunlight exposure, amount of offspring, longer, shorter