For a portfolio of $40$ randomly selected stocks, which of the following is most likely to be true?

Question $6$ options:

a$)$

The beta of the portfolio is larger than the weighted average of the betas of the individual stocks.

b$)$

The riskiness of the portfolio is the same as the riskiness of each stock if it was held in isolation.

c$)$

The beta of the portfolio is less than the weighted average of the betas of the individual stocks.

d$)$

The beta of the portfolio is equal to the weighted average of the betas of the individual stocks.

e$)$

The riskiness of the portfolio is greater than the riskiness of each of the stocks if each was held in isolation.