You must buy cupcakes and pizza for a party. each cupcake costs $3, and each pizza pie costs $12. you know that you need at least 5 pizzas so that each person can have at least 2 slices of pizza. in addition, you cannot spend more than $100. if you want to figure out how many cupcakes and pizza pies you can buy, what system of inequalities would you write? a. 3c+12p< 100 p≥2 b. c+p≤100 3c+12p≥5 c. 3c+12p> 100 p< 5 d. 3c+12p≤100 p ≥5