Firm A is heavily focused on exploiting their core competencies to gain and sustain a competitive advantage in Industry I $(98\%$ of revenues are from this industry$).$ Firm B is also very focused on gaining and sustaining a competitive advantage, but it operates in Industry I, II$,$ III, and IV $($revenues are evenly distributed among these industries$).$ All of these industries are related to Firm B$\text{'}$s core competencies. According to research on the diversification$-$performance link:

a$)$ Firm A is likely to have better performance than Firm B

b$)$ Firm B is likely to have better performance than Firm A

c$)$ Firm A and B are likely to have equivalent performance.

d$)$ Research on the diversification$-$performance link does not examine these types of differences in diversification