Which of These Is a Key Assumption of the Boston

Which of these is a key assumption of the Boston Consulting Group matrix?

A) A firm can be successful with a low market share if it successfully attracts and satisfies a niche market.
B) Low per-unit costs and high profitability are direct benefits of a high market share.
C) Strategic business units may be categorized on the basis of industry attractiveness and company business strengths.
D) The choice of a strategy depends on determining a firm's unique competitive advantage.