The company's chief executive, whose technological expertise, views on the future of the industry, and decision-making style were impressive to the managers who worked with her, was also acknowledged as a leading strategist by many people outside her firm, including executives at rival companies, whose approaches often differed substantially from her own.

(A) were impressive to the managers who worked with her, was also acknowledged as a leading strategist by many people outside her firm, including executives at rival
companies, whose approaches often differed substantially from

(B) impressed the managers who worked with her, also was acknowledged as a leading strategist by many people outside her firm, including executives at rival companies, whose approaches often differed substantially from

(C) was impressive to the managers who worked with her, was also acknowledged as a leading strategist by many people outside her firm, that included executives at rival
companies, whose approaches were different substantially in comparison to

(D) was impressive to the managers who worked with her, also acknowledged as a leading strategist by many people outside her firm, who included executives at rival
companies, the approaches of whom differed substantially when compared to

(E) were an impression to the managers who worked with her, also was acknowledged as a leading strategist by many people outside her firm, including executives at rival companies, whose approaches were often substantially different from that of
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I am going for B, because it uses impressed (one word) instead of were impressive (two words)
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Never give up,,,

Yeah it uses active voice instead of passive voice but rest of the sentence is awkward.
The company's chief executive also was acknowledged as a leading strategist by many people outside her firm

hence A is correct