Similarities between single column cash book and double column cash book

The answer is "The both cash book is used to store transactions are recorded"

Explanation:

Single and Double column cash book:

A single column cash book is also known as a basic cash book, which is primarily used to record a business cash transactions (both debit and credit sides), it has only a single cash column titled "number" that is annually counted and balanced like that of a T-account. A double columns cash book is also known as the two columns cash book, which is used to store both debit, credit, and discount sides, in which one for reporting money transfers and another for recording bank transactions.

The answer is letter a

The activity of providing goods and services involving financial and commercial and industrial aspects.