Step 1: Understanding the rainbow colours.
The rainbow consists of seven main colours: Red, Orange, Yellow, Green, Blue, Indigo, and Violet. Brown is not one of the colours in the rainbow.
Step 2: Analyzing the options.
- (a) Blue: Blue is a colour in the rainbow.
- (b) Orange: Orange is also a colour in the rainbow.
- (c) Brown: Brown is not a colour in the rainbow.
- (d) Red: Red is a colour in the rainbow.
Step 3: Conclusion.
The correct answer is (c) Brown, as it is not a part of the rainbow.
Final Answer:
The correct answer is (c) Brown.