Explanation

After the verb 'want', English requires an object followed by a to-infinitive: 'He wanted me to leave immediately.' The construction 'wanted that I left' is ungrammatical, and 'that I leave' (C) does not fit after 'wanted' — the subjunctive pattern belongs to verbs like 'demand', not 'want'. 'I may leave' (A) changes the meaning. Hence the answer is B.