8. Two years ago, Pete's age was 3 times his cousin Claire's age; four years ago, Pete's age was 4 times Claire's age. ( ) years later, the age ratio of Pete to Claire will be $2: 1$.
(A) 2
(B) 4
(C) 5
(D) 6
(E) 8
8. B.

Let Peter's age two years ago be $3x$, and Claire's age be $x$; $y$ years later, the ratio of Peter's age to Claire's age will be 2:1.
Then, according to the problem,
$$
\left\{\begin{array}{l}
\frac{3x - 2}{x - 2} = 4, \\
\frac{3x + 2 + y}{x + 2 + y} = \frac{2}{1}
\end{array} \Rightarrow \left\{\begin{array}{l}
x=6, \\
y=4 .
\end{array}\right.\right.
$$

Therefore, 4 years later, the ratio of Peter's age to Claire's age will be $2:1$.