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Option 3 : Only argument II is strong

I. Yes, they emit blue light which is hazardous to the environment as well as human beings.

LED lamps emit blue light which is hazardous to the environment as well as human beings but the risks and concerns are specific to overexposure to blue light during evening hours, and can be effectively managed and controlled.

So, the argument is not strong to be considered.

II. No, they are economical and better light than CFL’s.

Yes LED bulbs are the real winner in energy efficiency and are economical and better light than CFL’s.

So, the argument is strong enough to be considered.

Hence, only argument II is strong.
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