The author's thesis here is Goats are the solution to clearing brush from land.
What is thesis?
A thesis is a statement or theory to be proved.
What are Goats?
Goats are ruminant domestic animals.
What is a solution?
A solution is dealing a problem to be solved.
What is clearing?
Clearing is a process of making clean.
What is brush?
A brush is an implement used to clean the dust.
Here in the given passage, the author is taking about clearing brushes in which goats can be used in place of humans and machines from the land.
Hence the correct option is (B).
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