Why do we use the functions?a.To decrease the readability of codeb.Increases the size of the code, identical set of statements are substituted by function calls.c.Debugging of the code would be simpler if you use functions, as errors are uncomplicated to be traced.d.To reduce modularity

We use functions in programming for several reasons:

a. To increase the readability of code: Functions help to break our program into smaller and modular chunks. As our program grows larger and larger, functions make it more organized and manageable.

b. To avoid repetition and makes the code reusable: If a piece of code is used more than two or three times then it makes sense to make that piece of code a function. This helps to avoid repetition and makes the code reusable.

c. To make debugging easier: Debugging is easier in a function-based code, as when a function is debugged, it is guaranteed to work wherever it is called.

d. To increase modularity: Functions help to divide the program into modules. This makes our program more organized, easy to understand and maintain.

So, the correct answers are a, b, c and not d. The use of functions actually increases modularity, not reduce it.