What was the gulf of tonkin resolution? a. an authorization for the president to use military forces in vietnam b. a promise to aid the government of south vietnam c. an authorization to use force in korea d. the declaration that the spread of communism wouldn't be tolerated in asia

Correct  A.  An authorization for the President to use military forces in Vietnam.

The Gulf of Tonkin Resolution, passed by Congress in August, 1964, after alleged attacks on two US naval ships in the Gulf of Tonkin.  The key wording in the resolution said:

That resolution served as a blank check for President Johnson to send troops to whatever extent he deemed necessary in pursuance of the war.  Between 1964 and the end of Johnson's presidency in 1969, US troop levels in Vietnam increased from around 20,000 to over 500,000.

the indians crossed artificial boundaries, setting the stage for conflict

the answer is b.india