How does social justice tie into diversity

Which is not among the style choices a writer would use, if he or she is trying to establish a formal writing style/

How does the author view the idea that you have to be perfect in order to get into college

Which sentence is punctuated correctly? the shoes normally cost 40 dollars, however; we got them on sale. the shoes normally cost 40 dollars however we got them on sale. the shoes normally cost 40 dollars, however, we got them on sale. the shoes normally cost 40 dollars; however, we got them on sale.