What is the result?

Given the code fragment:
List<Integer> codes = Arrays.asList (10, 20);
UnaryOperator<Double> uo = s -> s +10.0;
codes.replaceAll(uo);
codes.forEach(c -> System.out.println(c));
What is the result?
A. 20.0
30.0
B. 10
C. A compilation error occurs.
D. A NumberFormatException is thrown at run time.

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