B. Better managing our natural resources
False, river valleys have too much waster so it would be flooded and not enough soul to effectively grow
From the reference made in the task, we can assume that 1/2 of the costume material is used for trimming. Given that she employs 48 yard of material, we hav divide this by 2 and get how many yards she has used for trimming.
The global winds are more likely to affect the warm ocean currents because they are surface currents, while the cold currents are deep.