P Element Transposition Requires the Enzyme Transposase,which Acts at the Ends

Multiple Choice

P element transposition requires the enzyme transposase,which acts at the ends of the P element.To find transposons in a germ line,which of these is best?

A) use of a "crippled" P element that cannot transpose itself but can produce the enzyme
B) use of a "crippled" P element that can be transposed if there is another source of transposase
C) use of a P element that does not share the genome of the germ line
D) use of restriction sites that flank the inserted P element
E) use of DNA ligase to incorporate the P element