Which sentence is correct in the interpretation of this text?

p. s.: could you explain your answer to me? why didn't you choose another alternative? explain it to me using grammatical rules?

a comprehensive study of wealthy families by private bank u. s. trust found that only 40% of high net worth investors feel 'bullishly optimist' about the market. at the same time, 10% said they felt downright pessimist and 12% described themselves as fearful of losing money. jim quilan, chief market strategist for u. s. trust, says a lot of rich people continue worry about regulation, washington gridlock, an the lingering effects of the federal reserve's unprecedented stimulus program, which has propped stocks and the housing market but hasn't done much for the rest of the economy. "there are lot of things keeping them jumping in with both feet', quintan claims. quintan says the rich may also be playing catch-up after sitting on the sidelines for the last few years. the study revealed that wealthy investors who currently hold more than 10% of their portfolio in cash were three times as likely to say they missed out on the market rally. 'these investors have been whipsawed. five years ago their big nest egg was shrinking dramatically' he says. some of these folks may have been lagging behind, now they're coming back.

a) the study was written without using techinical jargon, so that even the uninteated can understand its content.

b) the study actually is not only optimistic, but also sympathetic towards investors, as it author understand the investors' fears.

c) the report issued through

d) it is understandable that the u. s trust would realease such a timely report.