One Mole of an Ideal Gas at 25°C Is Expanded $\Delta$

One mole of an ideal gas at 25°C is expanded isothermally from 5.0 L to 10.0 L under such conditions that no work is produced in the surroundings. Which statement is correct?

A) ( $\Delta$ S_gas = 0)
B) ( $\Delta$ S_gas = Rln2/298)
C) ( $\Delta$ S_surr = 0)
D) ( $\Delta$ S_univ = 0)
E) ( $\Delta$ S_gas = $\Delta$ S_surr)