Answer please ABCD

Refer to the diagram below. Which of the following statements explains the "bowed- out" shape of this PPF? COPYRIGHTED MATERIAL. NOT TO BE SHARED. Toasters 35 30 25 20 15 10 5 10 20 30 40 50 60 70 Toothbrushes When more resources are used to produce toothbrushes, fewer resources are available for producing toasters As more toothbrushes are produced, the opportunity cost of toothbrushes falls O Some resources are more efficient at producing toothbrushes than they are for producing toasters As more toothbrushes are produced, the opportunity cost of toasters increases