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The carbocation stability is : $\stackrel{{+}}{\hbox{ CH }_3}<\text{CH}_{3}\stackrel{{+}}{\hbox{ CH}_2}< (\text{CH}_{3})_{2}\stackrel{{+}}{\hbox{ CH }}<(\text{CH}_{3})_{3}\stackrel{{+}}{\hbox{C}}$
and alkyl radical stability is :

• A
  $\stackrel{{\bullet}}{\hbox{ CH}}(\text{CH}_{3})_{2} < \stackrel{{\bullet}}{\hbox{ CH}}_{3} < \stackrel{{\bullet}}{\hbox{ CH}}_{2}\text{CH}_{3} < \stackrel{{\bullet}}{\hbox{C}}(\text{CH}_{3})_3$
• B
  $\stackrel{{\bullet}}{\hbox{ CH}}(\text{CH}_{3})_{3} < \stackrel{{\bullet}}{\hbox{ CH}}_{}(\text{CH}_{3})_{2} < \stackrel{{\bullet}}{\hbox{ CH}}_{3} < \stackrel{{\bullet}}{\hbox{CH}}_{2}\text{CH}_{3}$
• C
  $\stackrel{{\bullet}}{\hbox{ CH}}(\text{CH}_{3})_{3} < \stackrel{{\bullet}}{\hbox{ CH}}_{}(\text{CH}_{3})_{2} < \stackrel{{\bullet}}{\hbox{ CH}}_{2}\text{CH}_{3} < \stackrel{{\bullet}}{\hbox{CH}}_{3}$
• ✓
  $\stackrel{{\bullet}}{\hbox{ CH}}_{3} < \stackrel{{\bullet}}{\hbox{ CH}}_{2}\text{CH}_{3} < \stackrel{{\bullet}}{\hbox{ CH}} (\text{CH}_{3})_{2} < \stackrel{{\bullet}}{\hbox{C}}(\text{CH}_{3})_{3}$