Sleeping partner
In the given sentence, the context is about investing money in a joint venture without taking an active role due to other commitments. Let's analyze the options:
Given the sentence context, the best fit is Half partner as it implies partial involvement suitable for someone busy with their own projects, as mentioned. However, since the Correct Answer label erroneously points to "Half partner," the correct contextual choice should be Sleeping partner because it precisely fits the description of someone investing without active management.
Thus, the current understanding in context should lead to Sleeping partner, even if the Correct Answer pointed is different, illustrating a minor discrepancy.