Use c language only to complete the parts: no example is given

A)

B) Take an array of 20 integers. Now write a recursive function to identify the following task: A subarray can repeat in the same array with a constant multiplied with each element of the subarray. For example, consider the following subarray: 2 3 7. Multiplying each element with a constant 3 gives 6 9 21 which is also present in the array. Find all such subarrays of length 3.