I go option A all day everyday.
Although I happen to think it will be:
Hagelin-Lindberg-Fast/Kristo as the 3rd line.
In my book:
Kreider-Stepan-Zuccarello > Zuccarello-Brassard-Nash
Brassard is a black hole offensively 5v5, carried by Zucc and Pouliot in 13-14. Kreider-Stepan-Zuccarello was our best line last year, I can see Kreider scoring 30 if that line is kept together.
Hagelin-Brassard-St. Louis > Kreider-Stepan-St. Louis
Hagelin is a possession monster both ways and a good 5v5 scorer, St. Louis a great scorer but a defensive liability. 2nd option will score more, but Hags+Brass are better defensively 5v5 than Kreider+Stepan.
UFA/Fast-Miller-Nash > Hagelin-Miller/Lindberg-UFA/Fast
Nash can score by himself, and we should be able to find players that cover for him defensively. Hagelin's possession driving is wasted with unproven players, though the line is less risky.