Which one statement is true: a. Cash crops are grown in subsistence farming.b.Extraction is an example of tertiary activity.c. Gathering is a primary activity.d. Mixed farming is a type of subsistence farming.

Which one statement is true: a. Cash crops are grown in subsistence

1.	Which one statement is true: a. Cash crops are grown in subsistence farming.b.Extraction is an example of tertiary activity.c. Gathering is a primary activity.d. Mixed farming is a type of subsistence farming.
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