PLEASE HELP!

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According to the CAPM (capital asset pricing model), what is the single factor that explains differences in returns across securities? the expected risk premium on the market portfolio the beta of the market index the expected return on the market portfolio the volatility of a security None of the above Three type of call options on a stock have the same expiration date and strike prices of $50, $60, and $70. The market prices are $1, $2, and $4, respectively. You decided create a butterfly spread using those types of options. For what range of stock prices would the butterfly spread lead to a loss? The butterfly spread leads to a loss when the final stock price is greater than $70 or less than $50 The butterfly spread leads to a loss when the final stock price is greater than $57 or less than $67 The butterfly spread leads to a loss when the final stock price is greater than $77 or less than $57 The butterfly spread leads to a loss when the final stock price is greater than $69 or less than $51 None of the above