Which one of the following was a cause of the other three? OA
increased production of petroleum products
O B.
increased size and number of suburbs
C.
increased production of inexpensive cars
O D.
development of the tourism industry
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D.  development of the tourism industry

Explanation:

The development of tourism industry require the use of transportation services like buses, cars, and other vehicles that can be used to cover an appreciable distance from once homeland to the desired destination. This will elevate the production of inexpensive cars, and petroleum products. The transportation facilities can help the suburbs and the villagers to reach the urban areas to obtain employment and habitation.

is this like a kind of true or false question?