I need B and C explained for me. I know the answer for B is: A will go out and B

Question

I need B and C explained for me. I know the answer for B is:

A will go out and B,C, and D will get brighter, but why? I know the answer for part C is: D will go out but B and C will remain the same. Why? Wouldn't they get brighter?

This circuit has 4 identical light bulbs. Rank the brightness of the four bulbs. Explain. If points a and b are connected by a wire, what happens to the brightness of each bulb? Explain. Assume the connecting wire (from part B) is still in place. Now bulb D is removed from the circuit so no current can flow through that branch. What happens to the brightness of each bulb now? Explain.

Explanation / Answer

current will be maximum form bulb A (say I) and then through A and B ( i = I xD / (A + B + D))   then from D.

so briness A >B = C > D

B. A is shortcircuited .

current though A = 0  

B = C > D > A = 0

C. now all bulbs are in series . so same current .

A = B = C

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