Final answer:
The provided materials do not mention the specific roles or methods Sweden and Australia used to establish connections between Laos and its neighboring nations. Therefore, the correct answer is 'c. Not mentioned'.
Step-by-step explanation:
The question about how Sweden and Australia established a connection between Laos and its neighboring countries does not offer sufficient information based on the provided reference materials to ascertain a specific manner in which these connections were formed. In the historical contexts provided, there are mentions of different ways countries have interacted or established connections on the international stage, such as through diplomatic channels, economic agreements, or military alliances. However, there's no direct mention of Sweden or Australia's role in establishing connections for Laos.
In the case of Laos, references suggest support from agencies like the World Bank and involvement from partners such as China to improve infrastructure. But based on the given materials, there's no clear mention of the methods Sweden or Australia in particular used to facilitate Laos's relationships with its neighbors. Thus, the correct answer to the provided multiple-choice question, given the information available, is c. Not mentioned.