When Friends of Brian Richardson Went to the Carnival,they Always

When friends of Brian Richardson went to the carnival,they always wanted to take him with them because Richardson had an uncanny ability to win almost every arcade game he played.Usually by the end of the evening his friends were also winning because Richardson did not mind sharing his secrets.His friends urged him to write a book.After several attempts,Richardson created The Secrets of Amusement Park Games-Revealed.In the 85-page book,Richardson reduces the art of playing arcade games to a science.According to him,the trick is to realize each game is not a game of chance.Richardson's mini-book is available at Amazon.com for $5.95.
-Refer to Amusement Park Games.Because the benefits of reading the book and employing its techniques are obvious to anyone who has ever attended a carnival,The Secrets of Amusement Park Games-Revealed can be said to exhibit which product characteristic?

A) observability
B) trialability
C) compatibility
D) complexity