Answer:
Some of the items on my shopping list, chanterelle mushrooms, white asparagus, and eel, were impossible to find.
Explanation:
Commas in this case, generally your going to add commas in a place where you would take a breath. This wouldn't be colons because thats more of an indication of a place that you could also fit comma-and. Parenthesis clearly don't fit. The only other risk is dashes because you could in theory do "Some of the items on my shopping list-chanterelle mushrooms, white asparagus, and eel-were impossible to find. " But that doesn't read as smoothly so its the less safe of the two choices
Transition words and phrases help make a piece of writing flow better and connect one idea to the next. In this extract from Death of a salesman, Willy is held for someone who does not want to face reality. An evidence is that failing at his job, he still sees himself achieving great success in business. Here we need a transition word that illustrates the first sentence.
Answer D.