Answer:
Options E
Explanation:
Option E best explains what should complete the sentence. The passage is talking about energy and the concluding part is talking about visible equipment . visible equipment here talks about equipment that makes use of energy and are over estimated ,example of such is the visible lights like bulbs for electricity. The best options that completes the passage correctly is option C , as visible equipment are meant to be turned off and underestimate it when used by unobtrusive equipment like water heater.