the answer is A. hope this helps!
In the fifth period (1978-2000), sport psychology experienced a tremendous growth in applied research and professional service.
As the era's name suggests, sport psychology matured as a discipline and a field of professional practice between the late 1970s and the 1990s. In this period psychology experienced a tremendous growth in applied research and professional service.
Sport psychology is a specialty that employs psychological knowledge and abilities to solve difficulties related to athletes' optimal performance and wellbeing, the social and developmental elements of participating in sports, and systemic problems with sports environments and organizations.
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