In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.

Let me give you an example: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Question: Who believes Fagin's gang make wallets and handkerchiefs?
The answer to this example can be: Oliver.
Here is why: In the sentence "He believes they make wallets and handkerchiefs", the pronoun "he" refers to name "Oliver".

OK. solve this:
Passage: The vast majority of workers in Ratanakiri are employed in agriculture. Most of the indigenous residents of Ratanakiri are subsistence farmers, practicing slash and burn shifting cultivation. (See Culture below for more information on traditional subsistence practices.) Many families are beginning to shift production to cash crops such as cashews, mangoes, and tobacco, a trend that has accelerated in recent years. Ratanakiri villagers have traditionally had little contact with the cash economy. Barter exchange remains widespread, and Khmer Loeu villagers tended to visit markets only once per year until quite recently. As of 2005, monetary income in the province averaged US$5 per month per person; purchased possessions such as motorcycles, televisions, and karaoke sets have become extremely desirable.Larger-scale agriculture occurs on rubber and cashew plantations. Other economic activities in the province include gem mining and commercial logging. The most abundant gem in Ratanakiri is blue zircon. Small quantities of amethyst, peridot, and black opal are also produced. Gems are generally mined using traditional methods, with individuals digging holes and tunnels and manually removing the gems; recently, however, commercial mining operations have been moving into the province. Logging, particularly illegal logging, has been a problem both for environmental reasons and because of land alienation. This illegal logging has been undertaken by the Cambodian military and by Vietnamese loggers. In 1997, an estimated 300,000 cubic meters of logs were exported illegally from Ratanakiri to Vietnam, compared to a legal limit of 36,000 cubic meters. John Dennis, a researcher for the Asian Development Bank, described the logging in Ratanakiri as a "human rights emergency".
Ratanakiri's tourist industry has rapidly expanded in recent years: visits to the province increased from 6,000 in 2002 to 105,000 in 2008 and 118,000 in 2011. The region's tourism development strategy focuses on encouraging ecotourism. Increasing tourism in Ratanakiri has been problematic because local communities receive very little income from tourism and because guides sometimes bring tourists to villages without residents' consent, disrupting traditional ways of life. A few initiatives have sought to address these issues: a provincial tourism steering committee aims to ensure that tourism is non-destructive, and some programs provide English and tourism skills to indigenous people.Ox-cart and motorcycle are common means of transportation in Ratanakiri. The provincial road system is better than in some parts of the country, but remains in somewhat bad condition. National Road 78 between Banlung and the Vietnam border was built between 2007 and 2010; the road was expected to increase trade between Cambodia and Vietnam. There is a small airport in Banlung, but commercial flights to Ratanakiri have long been discontinued.
Question: What road was expected to increase trade between Cambodia and Vietnam?
Answer:
National Road 78.