The correct answer should be A. Whomever.
This is because this can be paraphrased as "the instructor has picked him" not "the instructor has picked he". Him corresponds to whomever while he corresponds to whoever.
There were several problems that the Church faced during
this period. There was the Black Death
which ravaged Europe and caused the deaths of thousands of people. There was the transfer of the Papal Seat from
Italy to Avignon, France that gave an indication that the French now had power
of over the Papal Seat. This led to
elections of various popes known as the Great Schism where there was now
conflict within the Church.
D, notice how the first 3 answers are alike! They are all personal where as the 4th is more of a statement not made personally