Option C states that H erectus did not put in enough effort in finding good quality stones to make their tools. Option A adds to this point with an example. CA is a strong link. Now, option B states that H sapiens and Neanderthals tried harder to make good quality stone tools, while D states that their "lackadaisical" attitude, combined with their inability to adapt to a changing environment, led to the "population's" demise. Which of these relates best to the idea in CA? Both C and A talk of H erectus and their laziness, so to say. C mentions that the tools were crucial to the survival of the species. Clearly, D draws a conclusion based on the facts in C and A. CAD makes a cogent paragraph. How other species made their stone tools does not fit in here: B would probably be the starting point of the next paragraph. So, this is the option to be eliminated. Correct Answer: Choice (B)
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