Boolean algebra is essentially based on

Options

A. number
B. truth
C. logic
D. symbol

Explanation

To solve the question "Boolean algebra is essentially based on," we will analyze the options provided and determine the correct answer step by step.

### Step 1: Understand the Options
The options given are:
- A) Number
- B) Truth
- C) Logic
- D) Symbol

### Step 2: Analyze Each Option
- **Option A: Number**
Boolean algebra does not primarily deal with numbers. It focuses on binary values (0 and 1) rather than numerical calculations. Therefore, this option is not correct.

- **Option B: Truth**
While truth values (true and false) are part of Boolean algebra, they are not the foundational basis. Truth values are outcomes of logical operations rather than the core principle of Boolean algebra. Thus, this option is also not correct.

- **Option C: Logic**
Boolean algebra is fundamentally based on logic. It deals with logical operations and the manipulation of logical statements. The high and low levels in logic correspond to true (1) and false (0) in Boolean algebra, making this option a strong candidate for the correct answer.

- **Option D: Symbol**
Symbols are used in Boolean algebra to represent logical operations and values, but they are not the essence of what Boolean algebra is based on. Therefore, this option is incorrect.

### Step 3: Conclusion
After analyzing all the options, we conclude that the correct answer is:
**C) Logic**