Because they were eye witnesses to the crime,Amy, Sue and Jack were called to testify at the robbery hearing.
a) Amy, Sue and Jack were called to testify at the robbery hearing(correct)
b) Amy, Sue and Jackthey were called to testify at the robbery hearing(Usage of pronoun immediately after the noun is wrong)
c) Amy, Sue and Jackwas called to testify at the robbery hearing(There are three persons. So usage of was is wrong)
d) Amy, Sue and Jackwere calling to testify at the robbery hearing
...
a) Amy, Sue and Jack were called to testify at the robbery hearing(correct)
b) Amy, Sue and Jackthey were called to testify at the robbery hearing(Usage of pronoun immediately after the noun is wrong)
c) Amy, Sue and Jackwas called to testify at the robbery hearing(There are three persons. So usage of was is wrong)
d) Amy, Sue and Jackwere calling to testify at the robbery hearing
...
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