1. Neither I'd rather have 100% block time duration. (even if its short) However, if I MUST pick an option it would be B.
2. C first and foremost maybe E and D in that order
3. A
4. A (such a powerful spell should be 95+ ish)
5. B for FF History sake if that is not possible A
6. A, B, D. Unless its charge based (like shadows) then it should block AoE one per charge. (D and E) Also, reflect should only block Spells so en/spike dmg will still get through

Guess I made that more complicated then it had to be. Sadly I don't perfectly agree with many of the choices.