Answer:
C) Pre-funded general obligation funds.
Step-by-step explanation:
Since this customer is looking to preserve his capital and income in retirement (he is 68 years old, if he isn't retired, he will soon be). Since his tax bracket is very high, he should invest in bonds that do not pay federal income taxes, like pre-funded municipal bonds. These are very safe investments that generally have shorter maturity dates. That way, both of the client's needs will be met: secure investments and income.