Assumption I: Artificial honey can be prepared. This is indeed implicit, as the advertisement implies a distinction between pure/natural honey and artificial honey.
Assumption II: People do not mind paying more for pure and natural honey. This is not necessarily implicit from the statement; the advertisement does not provide enough information to conclude that people are willing to pay more.
Assumption III: No other company supplies pure honey. This is not implicit either, as the advertisement doesn’t suggest that only company X provides pure honey.
So, the correct option is (A): Only I is implicit.