I'm pretty sure that it is A. I really hope this helps. <3
The best cause is erosion creating waves and pushing forward the line where the sand starts
Biogas is a renewable, as well as a clean, source of energy. Biogas plants significantly curb the greenhouse effect: the plants lower methane emissions by capturing this harmful gas and using it as fuel. Biogas generation helps cut reliance on the use of fossil fuels, such as oil and coal.
Idekicoukdnteventellyouthat