Jared comes across this passage as he is reading about new car technology:

most major car manufacturers now offer a form of lane departure warning system in their new models. these systems alert the driver when he crosses a line without signaling first. the goal is to address drowsiness at the wheel, although studies have shown it is not as efficient as initially expected. which of the following inferences could be supported by this textual evidence?

a. all new cars in this model year will come with a lane departure warning system.

b. most car manufacturers want to alert drivers when they cross a line without signaling.

c. lane departure warning systems need to be improved before they can become a standard feature.

d. lane departure warning systems are not as efficient as major car manufacturers expected them to be.