Answer:
The correct answer is option B and option D.
Step-by-step explanation:
The US economy is a capitalist or market economy. In such an economy, the firms are constantly entering and exiting various industries. Existing firms exit the industries because of technological change, bad management, bad decisions, adverse shifts in consumers' tastes and preferences.
At the same time, new firms enter the market or other firms hire new workers because they are doing good because of the opposite reason.
This expansion and contraction in the business create and destroys millions of jobs each year in the US market.