If a Japanese company's board does not have committees, it most likely:

Many Japanese companies use a statutory auditor system (Option B) instead of board committees for oversight. In this approach: A statutory board of auditors (kansayaku) monitors management rather than a traditional audit or governance committee. This structure is legally permitted in Japan and is different from Western corporate governance models that require independent board committees.
Option A (cross-shareholding practice) refers to companies holding each other’s shares to maintain business stability but does not directly explain the lack of board committees.
Option C is incorrect because Japan’s Corporate Governance Code allows the statutory auditor model.
Reference: Japan’s Corporate Governance Code (2021 Revision) Tokyo Stock Exchange: Corporate Governance Reports OECD Corporate Governance Factbook