Which of the Following Experimental Procedures Would Most Likely Reduce

Which of the following experimental procedures would most likely reduce transpiration while allowing the normal growth of a plant?

A) subjecting the leaves of the plant to a partial vacuum
B) increasing the level of carbon dioxide around the plant
C) putting the plant in drier soil
D) decreasing the relative humidity around the plant
E) injecting potassium ions into the guard cells of the plant