Is the failure to sell the car, in response to the father's request out of fear of traffic congestion, considered disobedience to him, knowing that the car is essential for studying abroad?

A car is often a necessity, not a luxury. There is no justification for a father to prevent his daughter from owning and driving one, as long as she is skilled in driving. Accidents do not differentiate between a driver and a passenger. Therefore, the father should not be obeyed in this matter, and an attempt should be made to gently persuade him without openly disobeying him.