Respuesta :
The right answer for the question that is being asked and shown above is that: "d. among." The secretarial tasks are divided among several people. That is the correct word that is to be used.
The word missing to make the sentence logical is a preposition, which is contained in option d. The idea of the sentence implies collaborative work. When a task is performed by a pair of individuals, the right preposition is between; whereas when referring to a group of individuals, it is necessary to use among. The hint to be able to select the right answer is "several people".