Well, to continue, ________, there is also research that demonstrates that individuals perform worse, not better, on tasks when other people are there.
句意： 那么， 我接着说， 正如我之前提到的， 也有研究表明， 当其他人在做同一份工作时， 他们的表现会更糟， 而不是更好。 根据句意可知， as I mentioned earlier最为符合， 故正确答案为A。