Read the following passage carefully and answer the questions that follow by selecting the correct option from the given options, based solely on the passage. Mark your answer on the Answer Sheet accordingly. An attempt to determine the number of languages in the world is affected by other factors. A few new languages do continue to be discovered, even these days, as unexplored regions of the world begin to be opened

Step-by-step solution

The passage states that the discovery of a new language does not happen immediately because investigators initially assume it to be a dialect due to similarities with known languages. The passage explicitly mentions, "Only after a considerable period of contact does it transpire that the speech is so different that it has to be considered a different language." Therefore, establishing contact over a period of time with the speakers of the language is the way to establish the discovery of a new language. Answer: By