As the Four Winners of the Grade-School Spelling Bee Posed

As the four winners of the grade-school spelling bee posed for a picture, each was recollecting over the day's success. Which of the following children exhibits an external locus of control?

A) Chris, who thinks, "Wow! I'm really smart when it comes to spelling."
B) Lee, who thinks, "I really worked hard learning all those words and it paid off."
C) Terry, who thinks, "This is my lucky day! I was really lucky to get such easy words!"
D) Nat, who thinks, "I'll succeed by setting my sights on what I want and I'll keep trying!"