The correct answer is D. morale.
Morale is a state of mind that is characterized by confidence, enthusiasm, and determination. It is often used to describe the overall attitude of a group of people, such as a team or an organization. A team with high morale is more likely to be successful, as they will be more motivated and focused on their goals.
The other options are not as relevant to the question. Feeling is a general term that can refer to a wide range of emotions, so it is not specific enough to answer the question. Moral is a noun that refers to a system of beliefs about what is right and wrong, so it is not the correct answer either. Consciousness is the state of being aware of and responsive to one’s surroundings, so it is also not the correct answer.