Question

Which bulbs would be on and or off if :

Answer 1

Bulbs c and b would still be screwed in if they were in to begin with and bulbs A, D, and E. would be unscrewed

Answer 2

-- If Bulb-A is removed or burns out . . .
ON:  B,  D,  E
OFF:  A,  C

-- If Bulb-D is removed or burns out . . .
ON:  A,  C,  E
OFF:  B,  D 

-- If Bulb-E is removed or burns out . . .
ON:  none 
OFF:  all