How did the Saints know in advance that the presiding officer, Elder Bent, at Garden Grove, Iowa was about to die?
a. The Angel Moroni told them
b. Brigham Young prophesied it
c. Three Heavenly Messengers informed them
d. Elder Bent broke the news to them
(A) The next day
From the life of William Dydamous Johnson: His first knowledge of the latter-day work obtained through a Book of Mormon, which was brought to Michigan by Elmira Scoble while visiting her mother. During a fit of sickness he saw a vision, in which he was shown that the fullness of the gospel would be revealed in commotion with that book, and that he would be an instrument in proclaiming the same. He was baptized in Pontiac, Oakland county, Michigan, by Jared Carter, in January, 1833, ordained an Elder in the day of his baptism, and started on a mission the next day.
Andrew Jenson, LDS Biographical Encyclopedia (Salt Lake City: Publishers Press, 1901) 1:368.