It's C. peer pressure
Since internal factors are your own feelings, emotions, attitude, conscience or ethics etc. basically your inner persona; but <u>peer pressure</u> is an <u>external factor</u> of anybody's influence on you (excluding your own self), like the people at school, work, your family, friends etc.
Answer:
Step-by-step explanation:
1. Not
2. Yes
3. not
The last set is a function
a function can’t have the same two x values