Consider the following statements and choose the correct answer:
1. In order to increase the photosynthetic efficiency leaf area index should be increased
2. To increase leaf area index plants should be with horizontal leaves
3. If the time of grain-growth is increased, the grain-yield will decrease
4. Photosynthetic efficiency can be increased by monitoring moisture stress, transpiration loss and light intensity

A. 1 and 3 are true

B. 2 and 4 are true

C. 1 and 4 are true

D. 3 and 4 are true

Answer: Option C