To answer this question, you need to understand the concepts of hydraulic action, solution, abrasion, and stream erosion.
Option A) Stream erosion - This option is correct. Hydraulic action, solution, and abrasion are all examples of processes that contribute to stream erosion.
Option B) Stream deposition - This option is incorrect. Hydraulic action, solution, and abrasion do not contribute to stream deposition.
Option C) Stream transportation - This option is incorrect. Hydraulic action, solution, and abrasion are processes that contribute to stream erosion, not transportation.
Option D) Stream discharge - This option is incorrect. Stream discharge refers to the volume of water flowing through a stream, and it is not directly related to hydraulic action, solution, or abrasion.
Therefore, the correct answer is option A) stream erosion. This option is correct because hydraulic action, solution, and abrasion are all examples of processes that contribute to the erosion of streams.