In what way did climate change affect Ghana's position in the trans-Saharan trading networks?

The larger floods of the Niger River made consistent trade impossible.

The rise in temperature in West Africa made insect-born disease more common.

The desertification of Kumbi Saleh made it less important as a trade post.

The rise in temperature made food production difficult for large kingdoms.

Question

In what way did climate change affect Ghana's position in the trans-Saharan trading networks?

 The larger floods of the Niger River made consistent trade impossible.

 The rise in temperature in West Africa made insect-born disease more common.

 The desertification of Kumbi Saleh made it less important as a trade post.

 The rise in temperature made food production difficult for large kingdoms.