What new technology during World War I led to the development of the piece of equipment shown here?

A.the machine gun

B.poison gas

C.submarines

D.nuclear weapons

I think the answer is either B or D.
Can someone please help?

What is "shown here"?

Kinda like a gas mask

The site wont let me show the picture

This should be easy then. Which of the choices has anything to do with a gas mask?

What is one way that the low wages paid to workers in developing countries has had a negative effect on developed countries

A. Workers in developed countries have experienced job loss

B. Profits for multinational corporations have fallen

C. Trade between developed and developing countries has decreased

D. Consumers in developed countries have to pay more for imports

D. Consumers in developed countries have to pay more for imports.

What was the main reason that the United States became involved in the Vietnam conflict?

A. The United States wanted to support France in its fight to retain its colonies in south east Asia.

B. The United States had established an alliance with the government of north Vietnam.

C. The United States wanted to help strengthen the viet Minh in a struggle against China

D. The United States worried that if Vietnam fell to the communists other countries in south east Asia would follow

D. The United States worried that if Vietnam fell to the communists, other countries in southeast Asia would follow.

Out of the nearly seven billion people living on earth, about how many have access to the internet?

A. Fewer than one billion

B. Slightly less than half

C. Slightly more than half

D. More than 90 percent

C. Slightly more than half.

What was one positive outcome of the Cuban missile crisis?

A. It created an opening for talks between the United States and the Soviet Union

B. It brought an end to communist control of Cuba

C. It halted the arms race between the United States and the Soviet Union

D. It led to the fall of the Soviet Union