Step 1: Understanding the paragraph.
The paragraph discusses Ambani’s unusual, bold strategy of using equity to build a mass shareholder base that gave his company political influence. The missing final line must summarize this innovation and describe Ambani’s strategic brilliance.
Step 2: Evaluating the options.
(A) Correct — It directly connects Ambani’s use of business–politics nexus with visionary strategy, matching the paragraph's theme.
(B) Too narrow; the passage does not mention political investments.
(C) Irrelevant; the paragraph is about ownership, not household income.
(D) Describes rivals but does not conclude the main idea about Ambani’s innovation.
Step 3: Conclusion.
Option (A) best completes the thought by highlighting Ambani’s visionary approach to business and politics.