Can I please get help with the following questions?:

Both supply and demand increase. What will happen to quantities sold in a market?

A. quantities increase B. quantities decrease C. quantities don't change D. we can't tell without more info

Tastes change so that demand for a product falls. At the same time tax rates on the product paid by the producers were lowered. Given that output increased and prices fell as a result, which change had the largest effect?

A. Cant tell B. Change in tastes C. Change in taxes D. Likely about the same size