Explanation:

Correct Option 2: Apple

Let's decode step by step:

We are told:

• Orange is called Apple
• Apple is called Grapes
• Grapes is called Watermelon
• Watermelon is called Chikoo
• Chikoo is called Orange

Now, the question asks:
"Which of the following is orange in color?"

In real life, the fruit that is orange in color is Orange.

But in the code language:

• Orange (the real fruit) is called Apple

Therefore, the correct answer is: Apple