The antislavery movement raised and grew because people kept finding reasons for why slavery is bad. This eventually led to conflict between people against slavery and people for slavery. Another reason why the antislavery movement raised and grew was because slavery has become less useful overtime, as we have machines.
The correct answer to this open question is the following.
Although the question has no options, we can answer the following.
After 600 BCE, the world witnessed historical developments such as the surge of the Phoenicians in the Mediterranean Sea, a great group of sailors that built impressive ships for their time and developed the first kind of alphabet.
In that time, there were also important advancements in philosophy and religious beliefs such as the rise of Confucianism and Daoism, in China, or the influence of Zoroastrianism in the region of Persia, during the rule of the Sassadine dynasty.
