Which programming language is designed for the instruction of youngsters

A．began using binary numbers
B．was used to implement the Unix operating system
C．was put into the market
D．was used for modeling physical and environmental events

A．is extinct since the year of 1994
B．was found by a group of 17 researchers through the internet
C．is called "Grail Bird" because it is hallowed to the degree of holiness
D．is so famous that it has become a symbol of the spoiled relationship between human beings and nature