Answer: Identification
Explanation:
Source attractiveness is the mechanism in which products are upgraded and promoted through certain source which opted as attractive factor for customers.
Process of identification acts as convincing method by source attractiveness due to which customers or receivers are interested in product or component .They try to link with the source and perceive it by their beliefs,behavior, choice etc.
Other options are incorrect because comprehension, compliance,internalization and repositioning mechanisms are not responsible for source attractiveness perception through identifying sources .Thus, the correct option is identification.