In particular or in general ???

B.

Try to understand why B is correct.

Pick the one you think is right, and we will comment on your answer.

If we just give you an answer, you won't be forced to think about it, and you won't learn how to answer similar questions.

all right

Here is my way of thinking.

There were some rainy days ,but it was a nice day in particular =
it was particularlly (especially) nice day.

There were some rainy days but it was a nice day in general =
basically (as a whole) it was a nice day

So for me the first choice sounds more reasonable and I 'd go for A .
What do you th

Well, you interpreted "a holiday" as "a day". However, "a holiday" in BrE, unlike in AmE, isn't restricted to one day only and "some rainy days" tells you exactly that--- the holiday spanned several days and while there were some rainy days, the holiday, as a whole, was nice.

The same is true in American English - a holiday can be one day (like Independence Day), or a vacation of many days.
So I agree with Ivanhr's logic, that in general, (in spite of the rainy days) the holiday was nice.

Here is a description that fits (A):

This holiday, in particular, was nice - the weather was perfect the entire week, our hotel was very comfortable,