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

The correct answer is Option (1) → The scooter was serviced by the mechanic and the brake wires were changed.

Passive of two clauses joined by “and”:

Change	Active	Passive	Why
Object becomes subject	the scooter	The scooter	The scooter receives the action of “serviced”, so it becomes the subject.
Tense kept	serviced	was serviced	“Serviced” is in the simple past, so the passive stays in the simple past: was / were + past participle (V3). “Was” because the scooter is one.
Agent (by ...)	The mechanic	by the mechanic	The mechanic is named, so the doer comes after “by”. “By the mechanic” is written once, after “was serviced”.
Second verb changed too	changed the brake wires	the brake wires were changed	“Changed” also has an object, “the brake wires”, so it too becomes passive. “Were” because the wires are many.
Full sentence	The mechanic serviced the scooter and changed the brake wires.	The scooter was serviced by the mechanic and the brake wires were changed.

When both verbs of such a sentence have an object, both become passive. Example: Dadi washed the dal and soaked the rice. → The dal was washed by Dadi and the rice was soaked.

Why the Other Options are Incorrect?

Option 2: The scooter was serviced by the mechanic and the brake wires was changed. — Incorrect. “Was” does not agree with the plural “wires”. It must be “were changed”.

Option 3: The scooter has been serviced by the mechanic and the brake wires have been changed. — Incorrect. “Has been / have been” is the present perfect. The active verbs “serviced” and “changed” are in the simple past.

Option 4: The scooter was serviced by the mechanic and the brake wires were changing. — Incorrect. “Were changing” is the past continuous active. The wires seem to change by themselves. The passive needs “were changed”.