Choice "D" is correct. The summary of significant accounting policies should disclose policies. The only policy in this question is the "basis" of profit recognition on long-term construction contracts. The other disclosures are accounting details and would be disclosed in other footnotes, but not in the summary of significant accounting policies.
Choice "b" is incorrect. The future minimum lease payments should be disclosed, but not in the summary of significant accounting policies.
Choice "c" is incorrect. Depreciation expense should certainly be disclosed, but not in the summary of significant accounting policies.
Choice "a" is incorrect. The composition of sales by segment should be disclosed, but not in the summary of significant accounting policies.