What is the deepest level of processing of information in memory

A)  triarchic level of encoding 
B)  attentional encoding 
C)  semantic level of encoding 
D)  dyadic encoding

The semantic level of encoding involves processing information based on its meaning, which leads to a deeper and stronger memory trace than shallow processing based on physical or superficial characteristics (such as attentional or dyadic encoding). The triarchic level of encoding is a theory that describes three types of encoding (analytic, synthetic, and practical) but it is not considered as deep as semantic encoding. Therefore, the correct answer is C.