Which of these is a popular type of Japanese noodle soup?

Ramen is a Japanese noodle dish. It consists of Chinese-style wheat noodles served in a broth; common flavors are soy sauce and miso, with typical toppings including sliced pork (chāshū), nori (dried seaweed), menma (bamboo shoots), and scallions. Ramen has its roots in Chinese noodle dishes. Nearly every region in Japan has its own variation of ramen, such as the tonkotsu (pork bone broth) ramen of Kyushu and the miso ramen of Hokkaido. Ramen's popularity extends beyond Japan, as it is known as rìshì lāmiàn in China, ramyeon in Korea, and has even made its way into Western restaurant chains. Instant ramen was exported from Japan in 1971 and has since gained international recognition.

Source: Wikipedia