The word "unwieldy" in the second paragraph is closest in meaning to _______.

A．Everybody can get rich with some financial assets.
B．The credit risk for treasury bonds is extremely high.
C．It's no use trying to know the advantages of stocks, bends and cash.
D．Everybody should realize the importance of distribution of their financial assets.

A．to make a more accurate prediction of trend
B．to improve efficiency and avoid unnecessary work
C．to save the trouble of approaching every member
D．to predict characteristics of the entire population