Based on the credibility of the sources provided, the most reliable source for Sienna to determine the major exports from China would be:
2. an encyclopedia updated in the last year
Encyclopedias are typically well-researched, written by experts, and regularly updated to ensure accuracy and relevance. Since this encyclopedia was updated recently, it is likely to provide the most up-to-date and reliable information about the major exports from China.
On the other hand, a 1972 almanac entry might be outdated and not reflect the current state of China's exports. Similarly, a website praising Chinese goods may have biased information and may not offer a comprehensive or accurate list of major exports from the country.
Therefore, Sienna should consider using the encyclopedia updated in the last year as it is more likely to contain reliable and current information on China's major exports.
