The correct option is B 1, 2 and 3
1. Personal Attributes: A good manager must have personal attributes such as being honest, sincere, truthful, trustworthy, understanding, loyal, etc.
2. Previous experience and training: Previous work experiences and training gives manager the opportunity to apply his skill set. It allows the manager to build up confidence about his ability in the workplace.
3. Professional attitude: A professional workplace attitude allows the employees to take pride in their work and improve worker performance. Hence, the manager must possess this quality.Hence, all three are the correct qualities required for a manager and therefore, D is the correct option.