Answer:
Option C.
Step-by-step explanation:
Social Controls can be simply be defined as the guildlines, the rules and regulations governing a set of norms. And in order to enforce norms, Sanctions are being used.
Looking at option the first and second options, that is options 'a' and 'b', both options are wrong because SANCTIONS can be both Positive and negative and NOT ALWAYS positive or negative but both. When you do some great things, maybe you helped an older person, or do well as a student in your academics, you will receive a positive sanctions and negative sanctions otherwise.
For option 'd', it is not true because sanctions are effective.
Option 'c' is correct because sanctions might be mild or severe. One might be sanction which may leads to prison for someone and sanctions may not lead to prison, but something less severe.