a) If energy prices go up, manufacturing costs go up, which ultimately increases the price of the notebook. This will also most likely lead to a decrease in quantity, as the manufacturing cost per unit is higher. This is a supply determinant.
b) In theory, the subsidy reduces the cost per unit to the manufacturer, which increases supply and often reduces price, again being a supply-side determinant. In reality, it creates an incentive for notebook manufacturers to keep doing what they are doing, disincentivizing cost-saving developments and alternatives. Why innovate when you can get free government cheese?
Anyway, supply determinant.
c) The price of an inferior good increasing tends to push some demand for superior goods, especially when the income to cost of good ratio remains the same for the inferior good but gets better for the superior one. Demand determinant.
