💡 Detailed Explanation
"示唆 (shisa)" means to indirectly suggest or imply something, often with the intention of making others infer it. This fits best with the context of "signs suggesting a strategic shift." "暗示 (anji)" also means to hint or suggest, but often implies influencing unconsciously or a more subtle, sometimes unintended, suggestion. "黙示 (mokuji)" refers to a tacit suggestion or implicit indication, often conveyed through silence or what is left unsaid, rather than through words or actions directly. "内包 (naihou)" means to include, contain, or inherently imply something, describing what is intrinsically part of or suggested by something, rather than an active act of suggesting. In this context, the "兆候 (signs)" are actively hinting at the strategic shift, making "示唆" the most appropriate choice.