The correct options are
A Urbanisation
B Industrialisation
C Tourism
D Dams
Urbanisation - Due to more and more migration to the cities/towns agricultural land, forest, grassland, etc. are being destroyed. Due to these human activities, ecosystems either change or get completely destroyed.
Industrialisation - In order to synthesise various products, raw materials are extracted from natural sources finally leading to their damage.
Toursim - People visiting different places for recreation, entertainment, etc., often do not judiciously manage their wastes. Mostly wastes like plastic bags and bottles are just thrown everywhere which disturbs the ecosystem of that place.
Dams - Contruction of dams require huge areas. Sometimes for constructing dams a whole forest area is cleared which leads to the diminishment of ecosystems.