Which of the Following Is True According to Porter's Model

Multiple Choice

Which of the following is true according to Porter's model?

A) When start-up costs are low, the threat of new entrants to existing businesses is high.
B) The power of buyers reduces when deep discounts can be demanded of suppliers.
C) The power of suppliers is high when constant competition forces them to innovate.
D) The threat of substitutes is high when there are very few alternative products.