Final answer:
Zacchaeus climbed a sycamore tree to see Jesus due to his short stature, which made it difficult for him to see over the crowd, leading him to find an elevated viewpoint.
Step-by-step explanation:
Zacchaeus climbed a sycamore tree to see Jesus because he was short and couldn't see over the crowd. This is detailed in the Bible, specifically in the Gospel of Luke. The story of Zacchaeus is often taught to illustrate the determination of Zacchaeus to see Jesus and how Jesus acknowledges those who seek him out. Thus, the correct answer to the question is A. Because he was short and couldn't see over the crowd.