In Their Closing Statement, an Attorney at the Company You

In their closing statement, an attorney at the company you are working for has just reported finding an unusual electromagnetic wave. This wave consists only of an electric and magnetic fields which are constant in time and do not vary. You are certain that the attorney is mistaken because

A) an electromagnetic wave must have fields that change with time to produce each other.
B) electromagnetic waves are mainly electric.
C) electromagnetic waves are mainly magnetic.
D) there needs to be a charge somewhere in order to have an electric field.