<span>The correct answer is
(4). Natural resources discovered under the North Sea in 1959. that became
major products in the United Kingdom are oil and natural gas. The exploitation
began in 1971. Through tankers, and later by pipeline. The largest platforms are
Ekofiks oil field, Statfjord oil field and Troll gas field.</span>
The Opium Wars greatly expanded Western influence in China. The wars also led to the weakening of the Chinese dynastic system and paved the way for uprisings such as the Taiping and Boxer rebellions.
