Stock$\_\_\_\_$ is the best choice if this is the only risky asset to be held by the investor; stock$\_\_\_$ is the best choice if this stock will be mixed with the rest of the investor's portfolio, currently composed soley of holdings in the market$-$index fund?

Question $8$ options:

A$)$

A; A

B$)$

B; B

C$)$

B; A

D$)$

A; B