Answer:
a. build on its weaknesses
Explanation:
The SWOT(strength, weekness, opportunity, threat) analysis, is an analysis used to check a firm's competitive position, and also to assess the potentials of the firm.
According to SWOT analysis, a firm should not build on its weakness, rather, it should build on its strengths. It should be open to work around its weaknesses, take advantage of the opportunities presented by the environment and also protect the firm from threats in order to succeed.
Option A is the correct option because a company should not build on its weaknesses according to SWOT analysis.