The correct answer for this question is option 'B'. Let's discuss why option 'B' is the correct answer in detail.

**Analysis of the Options:**
To understand why option 'B' is correct, let's analyze each option:

a)

b)

c)

d)

Out of these options, only option 'B' has a comma followed by a space. The rest of the options either have an extra comma or lack the space after the comma. Therefore, option 'B' is the correct answer.

**Explanation:**
In this question, we are given four options, and we need to select the option that correctly follows the given format. The format specifies that there should be a comma followed by a space in each option.

In option 'A', there is a comma but no space after it. So, this option does not adhere to the given format.

In option 'B', there is a comma followed by a space. This option satisfies the given format.

In option 'C', there are multiple commas without any spaces after them. This option does not meet the requirements of the given format.

In option 'D', there is a comma but no space after it. So, this option does not adhere to the given format.

Therefore, the correct answer is option 'B' because it is the only option that follows the given format of a comma followed by a space.

**Conclusion:**
In conclusion, the correct answer for this question is option 'B' because it is the only option that satisfies the given format of a comma followed by a space. The other options either have an extra comma or lack the required space after the comma.