The was a new way to solve problems and run research created during the scientific revolution. a) enlightenment

b) scientific method

c) heliocentric theory

d) renaissance

B. Scientific Method.

Explanation:

The scientific method is  a way of answering questions, or rather experimenting to build a hypothesis. It had the following steps, observation, forming a question, then hypothesis,  a prediction based on the hypothesis, testing the prediction, and using the results of the test to  adjust the hypothesis if needed, or to make a new one with new predictions.

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.

cuba is a multi-ethnic nation