What Happens in the Double- Slit Experiment with Electrons If

Multiple Choice

What happens in the double- slit experiment with electrons if we place an electron detector just behind one of the slits?

A) This provides no information concerning which slit each electron comes through, and has no effect on the pattern formed on the screen.
B) This tells us which slit each electron comes through, and has no effect on the pattern formed on the screen.
C) We can then predict the precise point at which the electron will strike the screen.
D) This tells us which slit each electron comes through, but it also changes the pattern formed on the screen.
E) This provides no information concerning which slit each electron comes through, but it does change the pattern formed on the screen.