He hurried to the railway station, ______ buying a ticket for her daughter.

A. with the purpose of　 B. on purpose of　 C. by purpose of　 D. at the purpose of

He hurried to the railway station, ________ buying a ticket for her daughter．

1. A.
   with the purpose of
2. B.
   on purpose of
3. C.
   by purpose of
4. D.
   at the purpose of