Explanation:
Box 1: No
Because it creates 4 Resource Groups and not 3 Resource Groups (RGS0, RGS1, RGroup4 and ResGrp8);
1.1: The Resource Group named with "[concat('RGS', copyIndex())]", creates RGS0 and RGS1;
1.2: The Resource Group named with "[concat('ResGrp', '8')]", creates ResGrp8;
1.3: The Resource Group named with "[concat('RGroup', length(parameters('obj1')))]", creates RGroup4 (As we can see, obj1 parameter has a length of 4 'propA', 'propB', 'propC' and 'propD'); Box 2: No Because it doesn't create a resourcer group named RGroup5; Box 3: Yes Because all resource groups were created in the East US Azure Region.