The correct answer is: Only argument I is strong.
Argument I is strong because it provides a reason why persons convicted of criminal offences in the past should not be allowed to contest elections in India. The argument states that such persons cannot serve the cause of the people and country. This is a valid reason because it is based on the assumption that persons who have been convicted of criminal offences are not fit to hold public office.
Argument II is weak because it does not provide a reason why persons convicted of criminal offences in the past should be allowed to contest elections in India. The argument simply states that it is democracy and that people should decide whom to vote for. This is not a valid reason because it does not address the issue of whether or not persons convicted of criminal offences are fit to hold public office.
In conclusion, only argument I is strong. Argument II is weak.