The changes in the automobile sector initiated after WWII was that they became more costly due to the usage of military technology.
Option A is correct.
WWII was started in the year 1939 and ended rill the year 1945 among the powerful nations of that time.
After the ending of WWII, the automobile sector became advanced and started using military technology in building upon automobiles. This resulted in an exaggeration of the cost of automobiles making them more costly to purchase.
Therefore, the change after WWII mentioned in Option A is correct.
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