Correct answer: D
I was between C and D, and ended up picking C. The first "new plant discovered" seemed to correspond with passage in that the economist "discovered", or found, a new economy within a multiplayer games, and the second "scientists debate" seemed to correspond to the passage B in that the author of passage B states his/her opinion regarding the application of tax law to multiplayer games, and in the last paragraph provides an alternate opinion to his/her own.
In D, the title for passage A seemed a little off ("creating new species").
Could someone explain why C is wrong?
ETA: just to reinforce my reasoning for C, and hopefully make my reasoning easier to correct, Q7 from this passage also highlights why I liked C. In Q7, TCR is B, where passage A is titled "an economist discovers new economic territory". This seems analogous to the "new planet discovered in solar systems" in Q10. So is C wrong because of it's title for passage B?