Final answer:
The opportunistic bomber's usual first choice for concealment of a bomb at a place of business is various.
Correct option is B.
Step-by-step explanation:
The opportunistic bomber's usual first choice for concealment of a bomb at a place of business is various. The answer is b. Various because it depends on the specific circumstances and the bomber's strategy. For instance, they may choose to conceal the bomb in a package, inside a vehicle, or even on their person.