I'd say
B. Contour Farming
since it's planting on a flat surface and creating w/ridges to help prevent water from taking the crops away
It D. Two oceanic plates moving together
Solution:
Two plants are crossed. One has the genotype Tt and the other has the genotype Tt. This means that both individuals are heterozygous.
According to this information, we obtain the following Punnett Square: