Answer:
The correct answer is letter "C": a requirement on railroads to keep a fireman on board after the introduction of diesel engines.
Step-by-step explanation:
Featherbedding is a term used to refer to the act of labor unions requesting the hiring of new employees to cover certain duties. Typically, those duties seem unnecessary to the employer and only increase labor costs for the company. Featherbedding is a practice that unions deny to be developing but it is typically used as a form of avoiding employees to be laid off or to reassign duties to some of them.