Write multiple if statements:

If carYear is before 1967, put "Probably has few safety features.\n" to output.

If after 1970, put "Probably has head rests.\n" to output.

If after 1992, put "Probably has anti-lock brakes.\n" to output.

If after 2002, put "Probably has airbags.\n" to output.

Ex: If carYear is 1995, then output is:

Probably has head rests.
Probably has anti-lock brakes.