Which is the BEST revision of sentence 7 to provide variety and prevent it from being too similar to the structure of the other sentences in the paragraph? a. It is no longer the country's highest or most massive dam, but Hoover Dam set the precedent for modern dam-building technology b. There are higher and more massive dams today, but Hoover Dam set the precedent for modern dam- building technology Though there are higher and more massive dams today. Hoover Dam set the precedent for modern dam-building technology. d. Leave as is. I am timed and need an answer quickly please.​