BOTH STATEMENTS ARE TRUE BECAUSE S1 SAYS BOTH F AND G ARE ONE-ONE WHICH MEANS EACH ELEMENT IN A HAS AN IMAGE IN B,LIKEWISE B HAS IMAGE IN C ,THAT RESULTS ELEMENT IN A TO HAVE IMAGE IN C
FOR 2ND STATEMENT, WHEN G IS ONE ONE AND GoF is surjection,we can replace B with C and Get all preimages of C in A resulting F to be Surejection.