On February 28, 2017, the last bullet under the Key findings section on page 1 was revised to correct a typographical error. The year in the latter part of the sentence was changed from 1999 to 2010 as follows: In 2015, the percentage of drug overdose deaths involving heroin (25%) was triple the percentage in 2010 (8%).
Go to a safe place and call the police
This is not really a question.
Answer:
It is most likely going to be C. Susan is on a fixed-ratio schedule of reinforcement.
Explanation: