d. achievement-oriented
The Path-Goal Theory states that Dr. Weiss would respond best and benefit most from an achievement-oriented leadership style. An achievement-oriented leader sets high goals for their employees and expects them to perform at their best. The employees are not told the specific ways to meet these high goals, being expected instead to use their own abilities to figure out how. An achievement-oriented leadership style is known to work for sales and especially scientific fields, such as the one that Dr. Weiss works in.