It allows power boats to have stability while cruising. The cathedral hull is like a trimaran in terehat it has one main and two side hulls stuck together so that has a somewhat square to rectangular shape and therefore exhibits greater stability than a single hulled boat. It became more popular with the advent of fibreglass boats in the 1960's and '70s.
During the twentieth century, transportation had been very significant and played a great influence in the advancement of medicine. This is because this made health care become more accessible to patients no matter where they are located. The answer for this would be option C.