Maglev trains have many advantages. They are fast, safe, and environmentally friendly.

According to the passage, when could people start using a maglev commercially A) In 5 years. C) In 20 years. B) In 10 years. D) In more than 20 years. A: According to the passage, when could people start using a maglev commercially B: In 5 years. C: In 10 years. D: In 20 years. E: In more than 20 years.