Answer:
c. Customers sign up for "rewards" programs for different grocery stores so that they can get discounts on different items throughout the store.
d. People enable GPS on their phone so that Apps can locate nearby stores, restaurants and hotels.
Explanation:
The options choosen above shows the ways through which people gives up their privacy inorder to gain something in return. In the case of customers signing up for "rewards", their informations are needed before such signup is completed. Informations like address, phone number, email e.t.c while using GPS on thier phone so that Apps could locate nearby stores could expose them to hackers who could hack into their banking platforms.