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

One expects better behaviour from a senior student.

Better behaviour is expected from a senior student.

The correct option that expresses the given sentence in passive voice is Better behavior is expected from a senior student.

The other options are incorrect because:

• Better behavior was expected from senior student is in the past tense, while the original sentence is in the present tense.
• As a senior student you need to behave is in the active voice.
• Senior student behavior is expected better is grammatically incorrect. The adjective "better" should be followed by a noun, but the noun "behavior" is in the singular form.