You are presented with the quiz "To promote plant growth, vineyards are often" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "aplant requires sunlight to grow" and "vineyards are vertically trellised, low to the ground, increasing sunlight exposure in the fruit zone". 

So, what's the best answer to the question?


 

      vertically trellised     