____________________________________ an extra suitcase.

The correct answer reflects the need for a more complex structure to express the action of bringing an extra suitcase. "What I did was take an extra suitcase" successfully emphasizes the action in a way that adds context or motivation behind the decision to take the suitcase. This phrasing is appropriate for transforming a more straightforward statement into one that conveys personal involvement and the reasoning behind the action.

In contrast, the other options may lack the required nuance or do not fit as well in contexts that require detailed personal reflection. The phrase "I had to bring" implies necessity but doesn't incorporate the aspect of reflection or explanation that option B does. "I decided to carry" indicates a choice but is less personal and engaging. Lastly, "I was able to manage" suggests a capacity or capability that does not directly convey the action of taking the suitcase, making it less relevant to the prompt that calls for a statement about bringing an extra item.

Thus, option B stands out for its ability to articulate both the action and the thought process behind that action effectively.