The two sentences included in the excerpt that demonstrates that Shackleton felt his men displayed determination in difficult situations are the following observations :
"When we were all chilled almost to the limit of endurance, did we manage to get the stove alight and make ourselves hot drinks (The carpenter was suffering particularly, but he showed grit and spirit)"
"The slope we were traversing appeared to end in a precipice above this beach. (But our revived spirits were not to be damped by difficulties on the last stage of the journey, and we camped cheerfully for breakfast)"
Then, <em>B</em> and <em>D</em> are the answers to our question.
The sentence that uses an introductory comma correctly is option 1) “Wishing she'd just called in sick, Suzy unlocked her filing cabinet and began her daily work.” In this case, the comma is used after the subordinate clause to introduce the main sentence.
Option number 2 is not using an introductory comma, but the comma is separating two ideas.
And in option number 3, the comma is used to list a series of related items (eggs, milk, and bread).
I don't really understand the question. If you could please be more clear.
