The battle of concord led directly to which of the following events?
the election of washington as president
the defeat of cornwallis at yorktown
the victory of the revolutionaries at trenton
the siege against british troops at boston

The Battle of Concord led directly to the siege against British troops at Boston.

Explanation:

The battles of Lexington and Concord were armed confrontations between the Kingdom of Great Britain and the Thirteen Colonies of British North America that occurred on April 19, 1775 in the County of Middlesex, Massachusetts, in the villages from Lexington, Concord, Lincoln, Arlington and Cambridge, in which the Americans obtained victory. These events supposed a point of no return and marked the beginning of War of Independence of the United States.

1700 men returned to Boston in a retreat in which the British did not know how to keep their lines of action secretly or perform actions with speed, and suffered heavy attacks, but most regular British arrived in Boston, where the occupation of different areas around this city marked the beginning of the siege of Boston.

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.