The most common placement for students with learning disabilities is

general education classroom.

Explanation:

General education classroom refers to the classroom which created to cater to selected group of people .

People with learning disabilities tend to need additional instruments or method in order to accommodate the learning process, and general education classroom will provide all these for them (for example, people with blind disabilities tend to be given Brailles to accommodate them)

the answer would be in this answer. someone already asked the question.  

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.