How do tectonic uplift and orbital variations combine to affect the long-term intensity of monsoons?     Together, these cause the period of the orbital-scale monsoonal response to decrease and increase the frequency of strong monsoonal circulations.   Together, these cause a decrease in the strength of monsoons over time as the uplifted area produces a rain shadow, reducing annual monsoonal precipitation.   Together, these cause the amplitude of the orbital-scale monsoonal response to increase and gradually exceed critical thresholds.   Together, these produce a linear increase in monsoonal strength over time.   Both C and D are correct

How do tectonic uplift and orbital variations combine to affect the long-term intensity of monsoons?

Together, these cause the period of the orbital-scale monsoonal response to decrease and increase the frequency of strong monsoonal circulations.

Together, these cause a decrease in the strength of monsoons over time as the uplifted area produces a rain shadow, reducing annual monsoonal precipitation.

Together, these cause the amplitude of the orbital-scale monsoonal response to increase and gradually exceed critical thresholds.

Together, these produce a linear increase in monsoonal strength over time.

Both C and D are correct.