单选题 By tradition, the leader of the majority party is appointed ______ by the Sovereign in the United Kingdom.

【正确答案】 A

【答案解析】[解析] 一般情况下国会下议院的多数党党魁或执政联盟的首领自动成为首相人选，人选经国王或女王任命后正式成为首相。故选A项。