A study found that criminals were less likely to be convicted of a crime after they underwent ...

A study found that criminals were less likely to be convicted of a crime after they underwent plastic surgery compared with before they underwent plastic surgery. What is the likely reason for this?
 
  a. The plastic surgery caused the criminals to be treated differently by society; thus, their repeat offenses were less severe.
  b. The plastic surgery caused the criminals to look more similar to the jurors and jurors tend to be more sympathetic with those who look more similar than dissimilar.
  c. The plastic surgery increased the self-esteem of the criminals; thus, they projected more self-confidence at their trials.
  d. The plastic surgery lead to the increased attractiveness of the criminals and jurors tend to be more lenient towards attractive people.