Select the option that will fill in the blank and complete the given series.
4, 8, 12, 16,?

Options

A. 20
B. 21
C. 24
D. 36

Answer

To solve the problem of completing the series 4, 8, 12, 16, ?, we will analyze the pattern in the series step by step.

### Step-by-Step Solution:

1. **Identify the series**: The given series is 4, 8, 12, 16, ?.

2. **Determine the pattern**:
- To find the pattern, we will look at the differences between consecutive numbers:
- From 4 to 8: \(8 - 4 = 4\)
- From 8 to 12: \(12 - 8 = 4\)
- From 12 to 16: \(16 - 12 = 4\)

3. **Recognize the consistent difference**:
- We can see that the difference between each pair of consecutive numbers is consistently 4.

4. **Calculate the next number**:
- To find the number that will replace the question mark, we will add 4 to the last number in the series (16):
- \(16 + 4 = 20\)

5. **Conclusion**:
- Therefore, the number that completes the series is 20.

### Final Answer:
The answer is **20**.