The correct answer is: Only argument II is strong.
Argument I is not strong because it does not provide a reason why adult education should not be given priority over compulsory education. It simply states that adult education will also help in the success of compulsory education, but it does not explain why this is the case. It is possible that adult education could actually hinder the success of compulsory education, for example if it takes away resources that could be used to improve compulsory education.
Argument II is strong because it provides a reason why adult education should be given priority over compulsory education. It states that adult education will help to eliminate adult illiteracy, which is a serious problem that has many negative consequences. Adult illiteracy can make it difficult for people to find jobs, participate in civic activities, and take care of their families. By eliminating adult illiteracy, we can improve the lives of millions of people and make our society stronger.
Therefore, only argument II is strong.