When the roots of the polynomial
$$P(x)=(x-1)^{1}(x-2)^{2}(x-3)^{3} \cdots(x-10)^{10}$$
are removed from the real number line, what remains is the union of 11 disjoint open intervals. On how many of these intervals is P(x) positive?
Answer Choices
A. 3
B. 7
C. 6
D. 4
E. 5