Answer:B. The portfolio of smaller stock are typically less volatile than individual small stock.
C. On average smaller stock have lower return than larger stock.
Step-by-step explanation:
The larger stock most times have a higher volatility than smaller stock and usually have better records of performance, this therefore makes their returns higher than lower stock.
On an average the volatility of a smaller stock is greater than that of a portfolio of smaller stock for the portfolio stock will compensate for one another to limit the volatility.
A treasury bill has a government guarantee, their return is therefore lower and same applies to their volatility when compared to smaller stock.