DEAR TUTOR:could you help explain the question d and e ,thank you ,feel so confuse!

Part A: RISK AND RETURN (30 marks) Use historical prices of the Australia market index All Ordinaries (^AORD) and the following four companies traded in the Australian market: Rio Tinto plc (RIO), BHP Billiton Ltd. (BHP.AX), ANZ Ltd. (ANZ. AX) and Wesfarmers Ltd. (WES) provided on CloudDeakin, answer the following questions:

a. Compute continuously compounded monthly return of the above stocks and index using adjusted Close Price (Adj Close) (5 marks). Hint: Use Excel function ln to compute the compounded monthly return.