Select the option that expresses the given sentence in active voice.

The flyer for the international symposium is being sent by students to institutes all over the country.

Students are sending the flyer for the international symposium to institutes all over the country.

The correct active voice of the given sentence is Students are sending the flyer for the international symposium to institutes all over the country.

The passive voice of the sentence is The flyer for the international symposium is being sent by students to institutes all over the country. This sentence is in the present progressive tense, which is used to describe an action that is happening now. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the present participle of the main verb. In this case, the subject of the active sentence is "the flyer" and the main verb is "send." The present participle of "send" is "sending." So, the passive form of the sentence is The flyer for the international symposium is being sent by students to institutes all over the country.

The active voice of the sentence is formed by putting the subject of the passive sentence before the verb and removing the verb "to be." In this case, the subject of the passive sentence is "students" and the main verb is "send." So, the active form of the sentence is Students are sending the flyer for the international symposium to institutes all over the country.

The other options are incorrect because:

• Students are being sent the flyer for the international symposium to institutes all over the country. is in the passive voice, but the subject of the sentence is "students," which is not the one doing the action. The subject of the sentence should be "the flyer."
• The flyer for the international symposium is sent by students to institutes all over the country. is in the simple present tense, while the original sentence is in the present progressive tense.
• The flyer is sending the students to institutes all over the country for the international symposium. is in the active voice, but the subject of the sentence is "the flyer," which is not the one doing the action. The subject of the sentence should be "students."