The correct option is C is taught
A sentence in passive voice focuses on the person or thing that receives an action rather than the person/thing that performs the action.
For example, 'My room was cleaned by me.'
The basic structure of passive voice is:
the appropriate form of the verb 'to be' + past participle
Option A: 'Is being teach' is grammatically incorrect. 'Is being' is in the present continuous tense, which must be paired with a past participle (taught), not the base verb (teach). Hence A is incorrect.
Option B: 'Teaches' is a verb in the active form: English teaches to us.... It changes the thing "English" to perform, rather than receive, the action. Hence B is incorrect.
Option D: 'Is teaching' is not the correct verb form used in the passive voice. 'Teaching' is a present participle whereas the required verb form is a past participle. Hence D is incorrect.
Option C: The structure 'is taught' is the most suitable one from these options.
The simple present form of 'to be', 'is' is used here. (The simple present tense states a general fact or a usual habit.)
'Is taught' is the appropriate structure, formed by the simple present tense verb 'is' + past participle (taught). Hence option C is correct.