The answer to the question is option 'A', which means that the grandmother fell ill the next day when she didn't pray for the first time. Here is an explanation in detail:

Explanation:
The given question is related to a grandmother who didn't pray for the first time, and we need to choose the correct option from the given ones. Let's discuss each option to understand why the correct answer is option 'A':

a) She fell ill the next day: This option seems to be the most appropriate answer because when someone is used to doing something regularly, and suddenly they stop doing it, their body and mind can react to it. In this case, the grandmother was habitual of praying, and when she didn't pray for the first time, it might have affected her physically or mentally, which resulted in her falling ill.

b) She made this her routine: This option is incorrect because the question states that the grandmother didn't pray for the first time, which means she was already following the routine of praying. So, this option doesn't make sense.

c) She took a break and went to the village: This option is also incorrect because the question doesn't mention anything about the grandmother taking a break or going to the village. So, this option is irrelevant.

d) None of the above: This option is incorrect because we have already explained why option 'A' is the correct answer.

Conclusion:
In conclusion, the grandmother fell ill the next day when she didn't pray for the first time. It is essential to understand that when we are habitual of doing something, sudden changes can affect our mind and body. Therefore, it is always better to maintain a routine and follow it religiously.

A