Difference between attain and reach

[Marian]

Test No. incompl/inter-20 "Will or Shall?", question 7

After a few minutes he ..........

(a) attains a river
(b) acquires a river
(c) nears a river
(d) reaches a river

Test No. incompl/inter-20 "Will or Shall?", answer 7

After a few minutes he reaches a river.

Correct answer: (d) reaches a river

Your answer was: incorrect
After a few minutes he attains a river.
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Hello everybody!
Please tell me why attains in this sentence is not proper?

[Mosteque]

because TO ATTAIN means almost the same as TO ACHIEVE, so you may attain your diploma or goal or an objective.
TO REACH connotes movement and getting to a particular place in space or time.
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obsequium amicos, veritas odium parit