The correct answer is: B. Only argument II is strong.
Argument I is weak because it does not provide any evidence to support its claim that jobs should be offered to only deserving candidates without any reservation for a particular group. It is possible that there are deserving candidates from single child families who would not be able to get jobs without reservation.
Argument II is strong because it provides evidence to support its claim that reservation in government jobs for candidates from single child families will help reduce the growing population in India. The evidence is that parents will be encouraged to adopt single child norm if they know that their child will have an advantage in getting a government job.
It is important to note that both arguments are based on assumptions. Argument I assumes that all candidates are equally deserving of jobs, and argument II assumes that parents will be motivated to have only one child by the prospect of reservation. These assumptions may or may not be true, and further research is needed to determine whether reservation in government jobs for candidates from single child families is a good idea.