The correct answer is option 4 - Edo.

Edo was the earlier name of Tokyo. During the Edo period in Japan (1603-1868), the city was known as Edo and served as the seat of the Tokugawa shogunate. It was a political and cultural center, attracting people from all over the country.

Option 1 - Osaka: Osaka is a city in Japan, but it is not the earlier name of Tokyo.

Option 2 - Kyoto: Kyoto is also a city in Japan, but it is not the earlier name of Tokyo either. Kyoto was the capital of Japan before Tokyo.

Option 3 - Samurai: Samurai refers to a social class of warriors in feudal Japan, and it is not the earlier name of Tokyo.

Therefore, the correct answer is Edo, as it was the earlier name of Tokyo.