Which type of processing involves the interpretation of sensations and is influenced by available knowledge

 The correct answer is :  top-down

Explanation:  This analysis starts the decision-making process in a global context and then goes on concreting and also moving towards a conclusion on which to act. The up-down process is when an individual follows some kind of goal or intention and processes the information by providing attention to environmental stimuli. It is a voluntary and goal-driven process.

i would say b. research typically uses a variety of sources

answer; collective security;