Consuming oil

Hi. My Honda City 2008 started consuming oil few months back. As per Honda Owner's manual, the engine oil can be consumed during normal operation. But I was worried so I kept having different opinions/suggestions. Now few days back one technician at Authorized Honda outlet has told me that one of the piston ring is a bit weak. He pulled out all 4 spark plugs and 3 of those were in perfect condition while one had some carbon contents with a bit of oil. He said piston ring at cylinder 2 is a bit weak. Please tell me what to do?

1)Should I go for ring replacement?
2) Should I go for a complete overhauling?
3) Should I go for change of engine (assembly)?

Option 2 and 3 doesnt click to me as car is having no problem what so ever. Fuel Consumption is exceptional. Engine power doesnt appear to have droped. Engine sound is very much satisfactory, rather soundless engine.

Few details I would like to add here
The car has never been run on CNG only on Petrol
There is no smoke from Exhaust pipe
There isnt any trace of Oil contents in exhaust pipe or Air Filter passage