While Mont Blanc was first climbed in 1786, most of the Alpine four-thousanders were climbed during the first half of the 19th century; the ascent of the Matterhorn in 1865 marked the end of the golden age of alpinism. Karl Blodig (1859–1956) was among the first to successfully climb all the major 4,000 m peaks. He completed his series of ascents in 1911.
When was the ascent of the Matterhorn?
1865
The context stated that the ascent of Matterhorn in 1865 marked the end of golden age of alpinism. So, to answer this question you will have to look for a time period and then based on that select an option from among the given ones..