Living in the central Australian desert has its problems,________ obtaining water is not the least.第一次选了A，第四次才选对了……

Living in the central Australian desert has its problems,________ obtaining water is not the least.第一次选了A，第四次才选对了……
Living in the central Australian desert has its problems,________ obtaining water is not the least.

第一次选了A，第四次才选对了……

Living in the central Australian desert has its problems,________ obtaining water is not the least.第一次选了A，第四次才选对了……
觉得还是选A 顺!
难道答案是C?