Clear!
So we need to guess the situation not only by the question also with answers
Thanks a lot!

As has been said before:

Signal the crash site first to avoid further accidents

If the answers were:
A. Place a warning triangle.
B. Park the car in a safe place.
then you must know whether it is a minor accident or a major accident.

You have an accident with a cyclist. What should you do first?

A / Notify the emergency services.
B / Check the condition of the cyclist.
C / Place the warning triangle.

Here the correct answer is given as C.
But in theory book it mentioned, "If there are only minor injuries , you can park the vehicle where it can be parked". So no need warning triangles.

Actually in this question, nothing is mentioned about how big the injury is. Also if the person having minor injuries, drivers can clear the intersection quickly without placing warning triangles!