Answer:
A. The marginal cost exceeds the marginal benefit.
This is basically saying that it costs more than the benefit. It's more expensive than it benefits you. Therefore, you shouldn't produce any more of them, since it doesn't benefit you that well and costs a bit much.
Answer:
Advantages
No air pollution.
Once you've built the technology, it's free.
It needs no fuel and is totally renewable.
Tides are totally predictable and reliable.
Offshore turbines have low environmental impact.
Disadvantages
.
Barrages are expensive to build.
Barrages have high environmental impact,
much like hydroelectric dams.
It only provides power about 10 hours each day,
when the tide is moving in or out.
It is limited to coastal areas.
It must be able to withstand storms.
For more information go to http://home.clara.net/darvill/altenerg/tidalquiz.htm
Make a schedule for everything. Focus on yourself and set goals so you don’t over stress yourself. Being at one with yourself can guide you to success. (Care for yourself first before anything).