In the scenario where a car is coming directly at you in your lane, the safest option to avoid a head-on collision typically would be:
B. Swerve to the left shoulder if necessary.
This option allows you to create space between yourself and the oncoming car, which can help prevent a collision.
However, keep in mind that swerving can introduce its own risks, such as losing control or hitting another vehicle, so it must be done judiciously. Maintaining your speed and position (option D) may lead to a collision if the other driver does not move back to their lane in time.
In real-life situations, always assess the environment and make the best decision based on the immediate circumstances.