C. D would have prevailed had it protested when B's mark was published for opposition. On these facts, B seems to have had the upper hand in 1997. Assume that B ignored D until March 2000, when D opened a Froots Sandwiches a block from B's sole shop. A. B has no basis for challenging D's new shop. B. D should win if a lawyer approved its mark after a comprehensive search.
B is unlikely to succeed in closing any of D's old shops.
D. D has no basis to challenge a new Froots Pizza being close to one of its older shops. Assume that B and D settled their dispute. B gave D a royalty-free license to use Froots on sandwiches and agreed not to sell sandwiches. D agreed not to sell pizza. A. Aside from honoring their promises, B and D can now basically ignore each other.