The answer is B: 173.

The rule
Add 24 each time.
The pattern as Python code
Here is a tiny Python program that follows the same rule. Type it into IDLE and run it to print the whole pattern, including the answer.
number = 29
for step in range(7):
print(number)
number = number + 24
When you run it, Python prints:
29 53 77 101 125 149 173
Pixel says: Try changing a number in the code and run it again. Can you make the pattern go on for 20 steps? Meow!