Ravi’s behaviour is worthy of . . . . . . by all the youngsters.

The correct answer is B. emulation.

Emulation is the act of copying or imitating someone or something. In this case, Ravi’s behavior is worthy of being copied or imitated by all the youngsters. This is because Ravi is a good role model who sets a positive example for others. He is kind, helpful, and always willing to lend a hand. He is also a hard worker and always puts his best effort into everything he does. These are all qualities that youngsters should strive to emulate.

The other options are not as appropriate in this context.

• Trial is the act of testing something to see if it works. This is not what is meant in this question.
• Following is the act of going after or coming after someone or something. This is not what is meant in this question.
• Exploration is the act of investigating or studying something. This is not what is meant in this question.
• Experiment is the act of doing something to see what happens. This is not what is meant in this question.