The real answer is F, all of the above. MissingNo would be E.
Rhydon had the first design.
Arceus created all Pokemon according to lore.
Mew was the ancestor of all Pokemon.
Bulbasaur and MissingNo were technically both the first in the Pokedex, with Bulbasaur being the first in the actual Pokedex, and MissingNo being #0, the true first number.