What is the purpose of the article?

According to the passage, which of the following was a basic feature of Bengal delta?

Which place of Bengal allowed people from all over the world to meet from very early times?

The spread of Bengali as a dominant language of the delta took centuries. This was not only because of the existence of other vibrant linguistic communities, however. Equally important was the fact that Bengali was not always the language of the rule, ritual or trade. Over the centuries state power in the Bengal delta has been held by a truly remarkable array of non-Bengalis, including Afghans, Turks, North Indians, Arakanese and Ethiopians. Thus there was a remarkable linguistic diversity, and many residents of Bangladesh must have been multilingual.
Identify the most logical conclusion -

Meeting Charles Blackmore changed the writer's opinion about -

When the expedition members set off, some of the group-

Which of the following best describes the team's experience of the desert?