Customized advertisements: A. are personalized suggestions of what to buy.
B. categorize the websites a person browses.
C. target people based on personal information.
D. playfully respond to people's IMs and texts.

b

Explanation:

the answer is subjective. i personally agree with the first answer for this question.

if one isn't strictly talking about objects then the correct answer would be 'my eyes' since according to this riddle i am asleep and in order to answer/open the door i need to open my eyes first of all.

however, if one is specifically looking for an object, then the first thing i would open would be the door

hope this !

free points are committed here! first to answer by writing this question and post is as an answer gets brainliest and everybody gets 30 !