What Will Executing the Following Snippet of Code Do

Multiple Choice

What will executing the following snippet of code do?
Dim example As String = "Good"
Example &= " Books"

A) This will produce an error.
B) This will not produce an error;however,line 2 will not change the String example.
C) This will not produce an error,and example's value becomes " BooksGood".
D) This will not produce an error,and example's value becomes "Good Books".