The correct option is
B Too
By reading the dialogue we can conclude that just like Arvind, Shobha has also started going to a new gym. Thus, the correct answer must indicate that Shobha has joined a new gym.
Option A is incorrect. 'Me in addition' does not make sense. Thus, it is not the correct answer.
Option B is correct. 'Me too' indicates that Shobha has also joined a new gym. Since it completes the sentence with the correct meaning, it is the correct answer.
Option C is incorrect. 'Usually' does not fit with 'me'. 'Me usually' does not give the correct meaning and thus, it is not the answer.
Option D is incorrect. 'Me sure' does not make any sense. Thus, it is incorrect.