The answer is A. Harrison is on a fixed-interval schedule of reinforcement.
Russian society is a bit more mature I guess or formal and they take care of many things such as friendship, and when they meet someone new they believe they are a stranger and do not feel safe. On the other hand in the Us society it is very happy and joyful where you have usual discussions, debates, conversations with friends, family and random people some times so that is what the difference is between the two.
Mi abuelo siempre ASISTÍA a las protestas en los 60’s porque CREÍA en una sociedad más justa.
Meaning of Literature in English
It's a system a letters that can be understood using touch. It is made for those with weak vision. This system can help blind people with understanding things from an elevator floor to a story book!
