"<span>d. high levels of both minerals and salinity" would be the best option, since without direct contact with larger bodies of water it's very hard for the minerals and salt to dissipate and "spread out".</span>
An Epoxy or epoxies
An epoxy is composed of two parts, a resin and a hardener. After proper mixing the epoxy begins the curing process. The benefit is the versatility of these blends to be tailored for specific applications. Depending on the situation the chemical reaction that occurs, once started does not finish until the curing process is finished, meaning that special situations like extreme heat, or underwater, once the epoxy process is started it will finish, regardless of most other most chemicals or factors in the surrounding environment.
Malcolm X promoted that idea of "separating the races" of white and black as one of the answers to the race problem in the United States, since he believed the two races could never truly live peacefully in a fully-integrated society.
Is there options for the question, or is this just a generalized question?