In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.
Q: The surrender of Confederate Gen. Robert E. Lee to Union Lt. Gen. Ulysses S. Grant 150 years ago on Thursday was a milestone event in the end of the Civil War. Thursday's commemoration in Appomattox, Virginia, included a reenactment of Lee's last clash with Grant's troops and of the Confederate surrender in a Virginia farmhouse on April 9, 1865. Ahead of the battle reenactment, the boys of the Confederate 11th Virginia were a seemingly pretty cool bunch as those portraying Union troops gathered several fields away at Appomattox Court House amid the rolling farm country dotted by neat brick buildings and white picket fences.Confederate Gen. Robert E. Lee surrendered to Union Lt. Gen. Ulysses S. Grant on April 9, 1865The surrender in Appomattox, Virginia, is considered a milestone event in the ending of the Civil WarRe-enactors gathered in Appomattax for a re-enactment of the Battle of Appomattox Courthouse 
 Questions:_ and Union re-enactors dressed in gear likened to what was worn during the Civil War, 150 years ago. (A) Confederate (B) Robert E. Lee (C) Union (D) Ulysses S. Grant (E) Civil War (F) Appomattox (G) Virginia (H) Lee (I) Grant (J) Appomattox Court House (K) Appomattax (L) Battle of Appomattox Courthouse
A: 
(A)