Which event did emerson call "the shot heard round the world"? a. the first shot fired at lexington b. the shots fired at the boston massacre c. the last shot fired at yorktown d. the first british cannon fire at bunker hill

d) all choices are correct

the correct answer option is: weapons.

explanation:

tensions rose as the two opposing superpowers competed for 'weapons'.

referring to the cold war (1945-1991), the two superpowers, usa and ussr, experienced a phase of struggle and conflict with each other. these two superpowers considered each other as a threat to their survival and thus opted for policies to strengthen their positions.

the two superpowers never went to war with each other directly but competed for weapons to preserve their positions.