The statement itself is a comment that we keep altering what is in fashion after every few months; it cannot remain static.

Let's look at each conclusion individually:

Conclusion I: This puts the blame on the fashion designers, which is not true. If designers did not know what people liked, the new fashion that gains highlight every six months would not gain that highlight. This option blames the fluid nature of fashion on the designers, which cannot be concluded. 

Conclusion II: This is a valid conclusion to draw. If fashion keeps changing every few months, it would imply that the masses like new things that come to the market occasionally and let go of older fashion trends, implying their susceptibility to novelty. 

Hence, only conclusion II follows. 

Therefore, Option B is the correct answer.