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Sentence Correction: Comparatives - Superlatives

A recent survey revealed that the most fuel efficient gasoline-run vehicle on the 2008 market was the Toyota Prius, which drove 48 miles per gallon on inner city roads.

This answer choice is grammatically flawed because it uses the incorrect preposition in after driving. The correct idiom is driving on the road.

This answer choice is grammatically flawed because it uses the incorrect preposition by before the market. The correct idiom is on the market.

Examples

These apples are the cheapest on the market.
This camera is the most expensive on the market.

This answer choice is grammatically incorrect as it misuses the Superlative form indicated here by the use of the word most. The Superlative form requires that the group under comparison be defined. However, this answer choice does not provide information about the group of which the vehicle was the most fuel efficient.

In order for this Superlative to be complete, this group must be defined.

This answer choice is grammatically incorrect as it uses the Superlative form incorrectly. The correct Superlative form is the most, not a most.

Correct!

This answer choice makes correct use of the Superlative form (indicated here by the word most) and uses the correct prepositions in the idioms on the market and on inner city roads.

the most fuel efficient gasoline-run vehicle on the 2008 market was the Toyota Prius, which drove 48 miles per gallon on

the Toyota Prius was the most fuel efficient gasoline-run vehicle on the 2008 market, driving 48 miles per gallon in

the most fuel efficient gasoline-run vehicle by the 2008 market was the Toyota Prius, which drove 48 miles per gallon on

the most fuel efficient gasoline-run vehicle was the Toyota Prius, which drove 48 miles per gallon on

a most fuel efficient gasoline-run vehicle on the 2008 market was the Toyota Prius, which drove 48 miles per gallon on