Final answer:
The statement: 'Recycling electronics prevents valuable materials from going into the waste stream,' best supports the assertion of needing recycling due to the proliferation of electronic devices.
Step-by-step explanation:
The sentence from the source that best supports the reason for the need of recycling due to the substantial growth of electronic devices is sentence 4: 'Recycling electronics prevents valuable materials from going into the waste stream.' This sentence directly addresses the idea of recycling as a means to prevent waste, specifically in the context of electronic devices. Unlike the other sentences, which either provide context or support the idea of device usage and donation, this sentence directly addresses the main argument: the importance of recycling.
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