Explanation
Correct answer: A.
Choice A is the best answer because “additionally” logically signals that the information in this sentence—that Idár founded the League of Mexican Women—is another instance of Idár fighting injustice, this time advocating for the rights of Mexican Americans.
Why the other choices are wrong
Choice B
Choice B is incorrect because “in conclusion” illogically signals that the information in this sentence sums up or concludes the discussion of Idár’s support for the Mexican people’s revolt. Instead, the founding of the League of Mexican Women is a separate instance of Idár fighting injustice.
Choice C
Choice C is incorrect because “for example” illogically signals that the information in this sentence is an example of how, as a newspaper reporter, Idár voiced support for the Mexican people’s revolt. Instead, the founding of the League of Mexican Women is a separate instance of Idár fighting injustice, this time in support of Mexican Americans.
Choice D
Choice D is incorrect because “rather” illogically signals that the information in this sentence offers a contrast or exception to the previous information about Idár’s support for the Mexican people’s revolt. Instead, the founding of the League of Mexican Women is a separate instance of Idár fighting injustice.