D is the correct answer.
The Book of Revelation does not explicitly identify the Two Witnesses. Some suggest Moses and Elijah because they perform miracles similar to those associated with them (Revelation 11:6). Others propose Elijah and Enoch, since both were taken to heaven without experiencing death (2 Kings 2:11; Genesis 5:24), leading some to believe they must return.
Another theory links the witnesses to the vision of the two olive trees in Zechariah 4. Although that passage strongly hints at a connection to Zerubbabel and Joshua the High Priest, it does not directly identify them as the figures mentioned in Revelation 11:4. Therefore, it is possible that the Two Witnesses will be individuals who come in the spirit and power of the prophets, much like John the Baptist. While some thought he might be Elijah (Mark 6:15), Scripture clarifies that he came in the spirit and power of Elijah (Luke 1:17).