PA $1-6($Static$)$ There are four hotels competing...

There are four hotels competing with otherwise very similar products on the dimensions of price $($$ per night$)$ and amenities $($measured by the number of $"$s awarded by customer reviews$).$

Which of these hotels are on the efficient frontier?

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Hotel B: price $=$$$150$ per night; rating:...$**$

Hotel C: price $=$$$300$ per night; rating $*****$

Hotel D: price $=$$$80$ per night; rating $**$