Being (1)/ a rainy day (2)/ I could not go out. (3)/ No error (4).

Options

A. 1. Being
B. 2. a rainy day
C. 3. I could not go out.
D. 4. No error

Answer

1

Explanation

It will be placed before being to complete the sentence appropriately.
Combination of two or more sentences is possible only when the sentences have a common subject.
Look at the examples given below:
I read the book. I returned it to the library).
Having read the book I returned it to the library.
Reading the book I returned It to the library.
It was a rainy day. I could not go out.
It being a rainy day I could not go out.