Answer:
The correct answer is its market share divided by that of the largest competitor.
Step-by-step explanation:
The competitive position of a firm from Boston Consulting Group Matrix's point of view is measured in terms of the percentage of the market served by the product i.e market share.
The relative competitive position is either computed using market share or revenue,invariably by diving the company's market share by the total market share.
However, when the total market share value is not available, the market share of the largest rival company can be sued as a proxy.