<span>..centers of international trade and commerce. </span>
The Chief of Staff controls the president’s calendar, limits access to the president, manages the staff, and helps the president in all aspects of domestic and foreign policy.
Option: A
Explanation:
In president's office there are number of staffs to look after the legislation, administration and social welfare related matter. Chief of staff is the person who controls the president’s calendar, limits access to the president, manages the staff, and helps the president in all aspects of domestic and foreign policy.
Staffs handles all the important files, fixed meetings with different parties then finalize all these thing with their chief executive staff. Later he finally convey the important matters to the president.
The question failed to provide the blanks spaces but I have come across this, here is the complete sentence with blanks filled;
<span>Mistakes can be mistakes of
"Fact", which allow a contract to be voided or mistakes of
"Value", which do not.
</span>
For a mistake<span> to discredit an
agreement, it typically should be a shared one about a material actuality or
fact. Rarely a one-sided mistake will discredit an
agreement.</span>
