Island, water. The other option given the information was valley, mountains, but that didn't work syntactically ("an" valley). So by process og elimination..
I think the correct answer among the choices listed above is option B. Decrystallization is not a method by which minerals form. Decrystallization is the breaking down of the mineral's crystalline structure therefore forming other products not a mineral.
Answer: its most likely b but I cant be 100 percent sure
Explanation: