What conclusion can be drawn from comparing the two graphs below? a. the growth of the automobile culture in the 1950s meant that new roads were needed. b. the economic boom of the 1950s did not extend to automobiles or highway construction. c. the automobile culture of the 1950s was largely restricted to urban areas due to the lack of new roads. d. the registration of new automobiles in the 1950s was slowed by the need for new highway construction.