What is a trust?

a. the selling a product below cost to drive competitors out of the market

b. an illegal grouping of companies that discourages competition

c. the laws that encourage competition in the marketplace

d. the combination of two or more companies into a single firm

Can you include the paragraph too ?

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.