How does the documentary say the explores were able to cross the river

It is extremely hard for someone to answer your question.

Based from the question, I'm assuming you have watched a documentary in class, or at least a part of it.

Unless you specify what documentary it is and someone knows what one it is, you're going to have to try your best to remember and answer to the best that you can.

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.