67. The circuit shown has an ideal ammeter with zero resistance and four identical resistance light bulbs which are initially illuminated. A person removes the bulb R4 from its socket thereby permanently breaking the electrical circuit at that point. Which statement is true of the circuit after removing the bulb?
(A) The voltage from B→C increases.
(B) The power supplied by the battery increases
(C) The voltage across R1 increases.
(D) The ammeter reading is unchanged.