"My mother takes the subway to the city."
Translation:Mijn moeder gaat met de metro naar de stad.
It should be accepted, in my opinion. I say 'de metro nemen' a lot... :)
Technically, the original "correct" answer should be removed as a possibility since it is not an exact translation, just as many other possible but not exact translations are "incorrect" :)
It's weird that the 'gaat met de metro' answer is accepted. Normally the translations here should be quite literal, and 'goes by metro' is different from 'takes the metro'. I'd expect only the 'neemt de metro' answer to be correct.
This "correct" answer is not exactly the same as the English. The English "takes" should be "neemt" not "gaat met" (goes with)