____ other good students,the teacher thinks Tom is ___ stude

____ other good students,the teacher thinks Tom is ___ student.
a.Compared with; a most satisfied
b.Compared to; the most satisfied
c.Comparing to; the most satisfying
d.Compared with; a more satisfying
选D的话,过去分词表被动,这句话主语到底是the teacher ,还是Tom,怎么理解