You are presented with the quiz "what flows with ease through soil if it's permeable?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "if soil is permeable then water easily flows through that soil" and "h2O is the scientific name for water". So, what's the best answer to the question?

Pick your answer from:
[1]. mulch;
[2]. wind;
[3]. NaCl;
[4]. CO 2;
[5]. h2o;
[6]. oxygen;
[7]. vapor;
[8]. H20;
Answer:
[5].