Which investment might have more hidden costs than others?
a. bonds
b. stocks
c. mutual funds
d. retirement accounts

Mutual Funds

Explanation: Stock and bonds are direct instruments in specific securities. When you buy a bond, you directly buy the security and the same is the case with stocks.

However in case of Mutual funds, you (the investor) buy the mutual fund which in turns buys the underlying security which can be either a stock or a bond. So, mutual funds pool money and buy the security. So, you are an indirect holder in case of mutual funds and hence have a higher cost than others

the correct answer would be b, when, queen, calder hall and london.

explanation:

we always capitalize words when a paragraph or sentence is starting, when an important name is used, when a place is being written, or simply when a noun is used, etc. so in this sentence, sentence is starting from 'when', so it will be written in capital letters. secondly, queen is considered to be an important person, so it will also be written in capital letter. next, the name of the town is mentioned, i-e calder hall, which will also be written in capital letters. in the last,   city name is being used, 'london', which will also be written in capital letters. so option b is the most appropriate one.