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The paragraph states that animals share many emotions with humans, such as joy, happiness, empathy, and grief, because of shared brain structures, particularly in the limbic system, which is responsible for emotions in both humans and animals. This is the key point that ties together animals' intelligence and emotional capacity, as discussed in the passage.
Option a: The passage does not attribute emotions to sensory and motor abilities. The emphasis is on brain structures, not sensory abilities.
Option b: While the passage states that animals share emotions with humans, this option fails to capture the reason behind this, i.e. shared brain structures. It misses the point that makes the emotional similarity possible, which is central to the passage's message.
Option d: The passage discusses animals' sensory abilities but does not suggest that their intelligence is superior to humans'.
Hence, option c is the correct answer.