Answer:
Option 4, is the right answer.
Step-by-step explanation:
Option 4, plant and animals grown to keep a family alive is the correct answer because the subsistence crops are those crops which the farmer grows for the consumption of his family. His primary motive behind the subsistence cropping is to keep alive or provide food to his family. However, for the profit purpose, farmer generally prefers commercial cropping rather than subsistence cropping.