求助一道GMAT语法题

求助一道GMAT语法题A surge in new home sales and a drop in weekly unemployment claims suggest that the economy might not be as weak as some analysts previously thought.A.claims suggest that the economy might not be as weak as some analysts previously thoughtB.claims suggests that the economy might not be so weak as some analysts have previously thoughtC.claims suggest that the economy might not be as weak as have been previously thought by some analystsD.claims,suggesting about the economy that it might not be so weak as previously thought by some analystsE.claims,suggesting the economy might not be as weak as previously thought to be by some analysts帮忙解释下整个句子和选择哪个选项,为什么?