Miniatures of the world famous glass pyramid at the Louvre Museum and the Temple of Heaven are being built near a copy of the Sphinx on the outskirts of Shijiazhuang, Hebei province. The Temple of Heaven replica is to the right of the Sphinx and the Louvre is to the left. The replicas belong to a film base, which charges a 10 yuan admission fee to enter and another 10 yuan if one wants to go inside the Sphinx's interior.
How much is the admission fee?
A. 10 yuan
B. 20 yuan
C. Free