The bar chart shows the number of pregnancies in four groups of 100 women over the same period. Each group used a different type of birth control. Which statement about the bar chart is correct?

The least effective of the four types of birth control is a chemical method.

The least effective of the four types of birth control is a mechanical method.

The least effective of the four types of birth control is a natural method.

The least effective of the four types of birth control is a surgical method.

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