I . . . . . . . a car to be absolutely necessary these days.

think
regard
consider
agree

The correct answer is A. think.

The other options are:

  • B. regard : to have a particular opinion about someone or something.
  • C. consider : to think carefully about something before making a decision.
  • D. agree : to have the same opinion as someone else.

In this case, the speaker is expressing their opinion that a car is absolutely necessary these days. The most appropriate word to use to express an opinion is think.