The quadratic equation `p(x)=0`
with real coefficients has purely imaginary roots. Then the equation `p(p(x))=0`
has
only purely imaginary roots
at real roots
two real and purely imaginary roots
neither real nor purely imaginary roots
A. only purely imaginary roots
B. all real roots
C. two real and two purely imaginary roots
D. neither real nor purely imaginary roots