Final answer:
Marco's compensation will be sourced proportionally based on the hours worked in each location.
Step-by-step explanation:
The correct answer is c. Proportionally based on hours worked in each location.
Marco's compensation will be sourced proportionally based on the hours worked in each location. Since he spent 100 hours working on the promotion in his office in New York and 50 hours working on the promotion in the London offices of the client, the compensation will be distributed accordingly.
This means that Marco will receive a portion of the $30,000 for the hours worked in New York and a portion for the hours worked in London.