Which sentence contains a preposition?

thomas edison and his assistant worked hard.

inventors have created many new inventions.

i read a book about the inventor thomas edison.

past inventors have made lasting contributions.

Prepositions are used to express the relationship between two or more places, persons or time or express a relationship in time or space.

Some of the prepositions are about, above, across, despite, except and so forth.

Therefore, the sentence which contains preposition is  I read a book about the inventor Thomas Edison.

In the above sentence, 'above' is the prepositions, which has several uses to reference position or movement, connection with, to mean nearby or near and so forth.

In the above sentence, 'about' as a preposition refers to the connection it makes with the inventor Thomas Edison by reading a book about him.

Explanation:

As a species, we are social beings who live out our lives in the company of other humans. We organize ourselves into various kinds of social groupings, such as nomadic bands, villages, cities, and countries, in which we work, trade, play, reproduce, and interact in many other ways. Unlike other species, we combine socialization with deliberate changes in social behavior and organization over time. Consequently, the patterns of human society differ from place to place and era to era and across cultures, making the social world a very complex and dynamic environment.