With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: In each country with an MB there is a Branch committee with a Masul (leader) appointed by the General Executive leadership with essentially the same Branch-divisions as the Executive office. "Properly speaking" Brotherhood branches exist only in Arab countries of the Middle East where they are "in theory" subordinate to the Egyptian General Guide. Beyond that the Brotherhood sponsors national organizations in countries like Tunisia ("Ennahda Movement"), Morocco (Justice and Charity party), Algeria (Movement of Society for Peace). Outside the Arab world it also has influence, with former President of Afghanistan, Burhanuddin Rabbani, having adopted MB ideas during his studies at Al-Azhar University, and many similarities between mujahideen groups in Afghanistan and Arab MBs. Angkatan Belia Islam Malaysia in Malaysia is close to the Brotherhood. According to scholar Olivier Roy, as of 1994 "an international agency" of the Brotherhood "assures the cooperation of the ensemble" of its national organizations. Outsiders are unaware of exactly how the agency is made up, but Egypt continues to have a leading position therein.
text_B: Would it be reasonable for someone who does not have much knowledge of the Muslim Brotherhood's operations to assume that the leadership position is assigned to the country with the largest population, meaning that it would, for all intents and purposes, belong to Egypt?
YES.