Answer:
A conditional indorsement
Step-by-step explanation:
A conditional indorsement is simply an indorsement entitling possession to the indorsee, however the title is retained till some condition stated in the indorsement occurs. In this case, Michaela made a conditional indorsement, which purely depends on a specific event occuring; in this case, the check can only be paid to Barbara if she completes the remainder of her book manuscript.