Final answer:
The opening sentences in Schaffer's essay 'The Value of a Sherpa Life' engage reader concern about the issue.
Step-by-step explanation:
The function of the opening sentences in Schaffer's essay 'The Value of a Sherpa Life' is c. engaging reader concern about the issue. By stating the tragic event of the avalanche and emphasizing that all the men who died were Sherpa porters, Schaffer creates a sense of emotional connection and empathy in the readers towards the issue of the value of a Sherpa life. This engages the readers and prepares them for the argument that Schaffer will develop throughout the essay.