What would be the best solution to the problem, according to the author? 1. Invention of a soundless mower. 2. Special agreement with landscapers. 3. Houses without yards. 4. Student protests.

What would be the best solution to the problem, according to the author? 1.  Invention of a soundless mower. 2.  Special agreement with landscapers. 3.  Houses without yards. 4.  Student protests.