Final answer:
Florence Nightingale is attributed with being intelligent, dependable, and ambitious. The leadership theory that attributes her as a leader based on these qualities is the Trait theory.
Step-by-step explanation:
The leadership theory that attributes Florence Nightingale as a leader based on her intelligence, dependability, and ambition is the Trait theory. This theory suggests that effective leaders possess certain traits or qualities that make them successful in their role. Florence Nightingale's development of statistical methods, dedication to working long hours, and fighting against societal perceptions of nursing demonstrate these leadership qualities.