A proposed law would require people to bring photo ID to polling places when they vote to curb potential fraud.

Intended meaning: law require people to bring ID to curb fraud (note, sentence does not intend to say that Law require people to bring ID when they vote to curb....ie vote to curb fraud. See the difference in meanig)

(A) places when they vote to curb potential fraud

(B) places when they vote, to curb potential fraud

(C) places, when they vote to curb potential fraud

(D) places, when they vote, to curb potential fraud

(E) places, to curb potential fraud by voting

tuanquang269 wrote:A proposed law would require people to bring photo ID to polling places when they vote to curb potential fraud.

(A) places when they vote to curb potential fraud - vote to curb is wrong intention expressed. POE.
(B) places when they vote, to curb potential fraud - correct usage of 'when ..vote complete idea is expressed here. hold.
(C) places, when they vote to curb potential fraud - vote to curb. eliminate.
(D) places, when they vote, to curb potential fraud - when ..vote separated doesn't express the complete idea in the first clause. Ellipses.eliminate.
(E) places, to curb potential fraud by voting -- wrong intention expressed. eliminate.

OA in later discussion