I think it is A
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The Incas had a centrally planned economy, perhaps the most successful ever seen. Its success was in the efficient management of labor and the administration of resources they collected as tribute. Economic exchanges were made using the barter system by which people traded with each other for things they needed.
The operational environment is generally described by the follwing conditions which are
1. Permissive
2. Uncertain
3. Hostile
You are entering an expressway and are in the acceleration lane you should speed up to adjust to freeway speed in acceleration lane and then signal and move carefully into freeway lane. You should not enter the freeway at a sharp angle, it can be dangerous.
