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

Sita made gulab jamuns.

Gulab jamuns were made by Sita.

The correct passive voice of the given sentence is Gulab jamuns were made by Sita.

The active voice of the sentence is Sita made gulab jamuns. This sentence is in the simple past tense, which is used to describe an action that happened in the past. The passive voice of the sentence is formed by putting the subject of the active sentence after the verb "to be" and the past participle of the main verb. In this case, the subject of the active sentence is "Sita" and the main verb is "make." The past participle of "make" is "made." So, the passive form of the sentence is Gulab jamuns were made by Sita.

The other options are incorrect because:

• Gulab jamuns made Sita. is in the active voice, not the passive voice.
• Gulab jamuns was made by Sita. is singular, while the subject of the original sentence is plural.
• Gulab jamun is made by Sita. is in the present tense, while the original sentence is describing an action that happened in the past.
• Gulab jamuns making by Sita. is not a complete sentence. It lacks a verb.