D. A new study
has cited [
faulty voting equipment, confusing ballots, voter error, and problems at polling places in estimating
{ that 4 million to 6 million of the 100 million (votes that were cast) }
had not been counted in the 2000 United States presidential election. ]
in estimating有歧义,逻辑上应该修饰has cited,但结构上又可修饰problems。