What was one of the major theological concerns addressed in canto iv?
a) the problem of what would happen to infants who died unbaptized
b) the question of why non-christians would be sent to limbo
c) the best way to reform non-believers
d) the dilemma that prevents mortals from visiting the underworld

The problem of what would happen to infants who had not been baptized

The correct answer is option a) "the problem of what would happen to infants who died unbaptized".

Explanation:

The section Canto IV of the "Divine Comedy" by Dante Alighieri, address the theological concern of what happens to the infants who died unbaptized. In this Canto IV it is explained that infants who died without receiving the sacrament go to the Limbo or Inferno 4, the first circle of Hell where no physical torment occurs.