Researchers have attempted to develop plausible theories about the methods used to transport the heavy
blocks. One of these argues that thousands of people worked together to move the stones.
문제가, 'these'가 가르키는 것은?, 인데요
저는 당연히 researchers인줄 알았어요. 그런데 답이 theories더군요.
왜 researchers는 안 되는 건지, 그렇다면 왜 methods도 안 되는 건지 알려주세요.