A Study by Walline Et Al

A study by Walline et al., (2009) randomly assigned one group of children to wear contact lenses and another group to wear glasses to correct myopia. Did the results of the study indicate any differences between the two groups?

A) Yes, those wearing glasses had lower global self-worth scores
B) Yes, those wearing contacts had lower global self-worth scores
C) Yes, those wearing contacts rated their physical appearances, athletic competence, and social acceptance more highly
D) No, there were no differences found between the groups