The standard deviation and expected returns for 4 portfolios (A,B,C,and D) are graphed on the following efficient frontier: 
Which of the following portfolios are attainable?
Definitions:
Machine-Hours
A unit of measure representing the operational time of a machine, used as a basis for allocating manufacturing overhead in traditional costing systems.
Relevant Range
The range of activity within which assumptions about variable and fixed cost behaviors are valid.
Gross Margin
A company's net sales revenue minus its cost of goods sold (COGS), expressed as a percentage. It reveals how much profit a company makes before expenses.
Relevant Range
The range of activity within which the assumptions about fixed and variable cost behaviors hold true.
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