Concept:The Gospels reveal that Peter and Andrew worked as fishermen on the Sea of Galilee before Jesus called them to follow him.
Explanation:Before becoming disciples, Peter and Andrew earned their living by fishing.
In the Gospel of Matthew, Jesus saw the two brothers casting a net into the sea and said, "Follow me, and I will make you fishers of men."
This statement directly identifies their occupation as fishermen.
The Gospel of Mark records the same calling beside the Sea of Galilee, showing that both brothers were actively working as fishermen at that moment.
Tentmaker does not fit, because Paul and Aquila were the tentmakers mentioned in the New Testament.
Tax collector does not fit, because Matthew, also known as Levi, was the tax collector chosen among the apostles.
Shepherd does not fit, because shepherds were in the fields when angels announced the birth of Jesus.
Therefore, the correct profession of Peter and Andrew was fishermen.
Answer:D. Fishermen.