Answer:
a) The other aircraft is crossing to the left
Explanation: An aircraft is any vehicle such as an airplane that is able to fly in the air through the support of the air. Aircrafts usually overcome the force of gravity fr it to be able to sustain it's long movement in the air. An aircraft can either be an airplane or a balloon etc.
One of the traffic signals of the air flight system is that if an aircraft is flashing and steady red light ahead at the same altitude,it means the airplane is crossing left.
