Is congo developed, developing or under developed?

Witch one is it soo it the the question b.a,b,c,d

The coco river is a natural border between nicaragua and which other country

You have been tasked with sorting the rock samples shown into three categories, with two rocks in each category. what attribute would you use to sort these rocks? which rocks would be in each category? rocks: obsidian, coquina limestone, granite, soapstone,pumice, and gneiss.