Factors of production that can be used together to enhance the other's productivity are a) substitutable inputs. b) complementary inputs. c) duplicate inputs. d) proportionate inputs.

B) Complementary inputs

Explanation:

According to my research on the answers provided, I can say that based on the information provided within the question the term being defined by the question are called Complementary inputs. These are inputs or in this case factors that better the productivity of the other factors and vice versa, or in other words complement each other.

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d.

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