The correct option is A Men and women have equal intelligence.
The lines, "Until then, people thought that only men could do jobs that needed people to be intelligent and organised, ... . Amelia proved that women can do so too." prove the statement in option D: "Men and women have equal intelligence.". Hence option D is correct.
A is incorrect because this line isn't implied by the passage, the passage gives an account of Amelia Earhart's life as a pilot who wished to explore the world, but it does not imply that girls who are explorers can become pilots.
Similarly, option B is not implied by the passage. Option D is not mentioned in the passage at all. The details given were about a specific individual, and options A, B and C tend to generalize these specific events, hence they are not true.