Explanation
Correct answer: A.
Choice A is the best answer because it most logically completes the text’s discussion of the use of songs by the Kwakwaka’wakw people to record and communicate ecological knowledge. The text indicates that some songs of the Kwakwaka’wakw people of Canada’s Pacific Northwest region document how the people used terraced gardens in intertidal zones to cultivate clams for food. The text also explains that archaeological evidence shows increases in "clam size and abundance" that occurred along with the implementation of this cultivation method, suggesting the method’s efficacy in not just supporting clam yields but also improving them. It follows, then, that the use of intertidal terraced gardens, as described in the songs, allowed the ancestors of modern Kwakwaka’wakw people to maintain clams as a food source and to cultivate larger and more numerous clams.
Why the other choices are wrong
Choice B
Choice B is incorrect because the text doesn’t mention anything about cultivation practices among non-Indigenous people in the Pacific Northwest coastal region. Though the text conveys that archaeological evidence suggests that the clam cultivation practice mentioned in Kwakwaka’wakw people’s songs was efficacious when implemented, it gives no indication that people other than the Kwakwaka’wakw adopted that practice.
Choice C
Choice C is incorrect because the text provides no information about the archaeological record as it pertains to Sakha and Kaluli songs and doesn’t suggest that there is less corroboration of practices described in those songs than there is of the clam cultivation practice described in Kwakwaka’wakw songs. The Sakha and Kaluli songs are mentioned early in the text only as examples of Indigenous songs that contain ecological knowledge.
Choice D
Choice D is incorrect because archaeological evidence that clam size and abundance both increased when Kwakwaka’wakw ancestors implemented intertidal terraced gardens provides information only about the past use of that method and doesn’t suggest anything about present practices. The text indicates that knowledge of a past clam cultivation method is maintained in Kwakwaka’wakw songs but doesn’t indicate whether modern Kwakwaka’wakw people use that or other fishing and farming practices used by their ancestors.