Answer :

konrad509
The probability that Cory picks a red pen is [tex]\dfrac{6}{10}=\dfrac{3}{5}[/tex]
The probability that then Todd picks a red pen is [tex]\dfrac{5}{9}[/tex]

[tex]\dfrac{3}{5}\cdot\dfrac{5}{9}=\dfrac{1}{3} \Rightarrow A[/tex]