A solid move, but Black has other interesting choices.
1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. b1c3  3... c7c5  4. c4d5  4... e6d5  5. g1f3  5... b8c6  6. d4c5  6... d5d4  7. c3a4  7... f8c5  8. a4c5  8... d8a5  9. c1d2  9... a5c5  10. b2b4 