4 Blackbeard and his crew got close to other ships by

Краткое пояснение:

Анализ текста:

• Согласно тексту: «They often learnt a ship's nationality and then raised that country's flag in order to appear friendly. This way Blackbeard's ship could get close to the other ship.»
• Эта тактика соответствует варианту D «showing the same flag as the other ship».

Ответ: D showing the same flag as the other ship.