Here's a problem to solve: A student is asked to make soil using the following substances: water, ore, humus, crystal, weathered rock, and metamorphic rock. Which combination of these substances should the student choose?

Among the 4 following options, which is the correct answer?

- A: humus, crystal, and ore
 
- B: water, weathered rock, and humus
 
- C: water, metamorphic rock, and crystal
 
- D: metamorphic rock, ore, and weathered rock
 