The mindset is a set of attitudes that somebody has. This means that the mindset has general and formed attitudes and represents the way of thinking that person thinks about the things. It is formed on the basis of education, environments, experiences that a person has acquired during a lifetime. It is not only important for learning and acquiring skills, but also for perception in general, for example, how to improve the relationship, how to protect yourself from illness, how to engage yourself successfully during a working day, etc.
The answer is: A.