Answer:
D. speed money.
Step-by-step explanation:
Speed money or grease money are monies payed to fasten a routine process. For example to gain approval for a project, to clear a shipment.
Speed money differs from bribery because the end result is something that will be done with or without the speed money, so it is given to speed the process along.
Sometimes speed money is obligatory. To show it was payed legally documentation should be done.