When people hear a sound, their ears turn the vibrations in the air into neural messages from the auditory nerve, which makes it possible for the brain to interpret the sound. This process is called .

a) encoding
b) storage
c) retrieval
d) evaluation

a) encoding              

Explanation:

Encoding: In psychology, the term "encoding" is also written as memory encoding and is described as the very first step involved among the three different stages of the memory process. However, to create a specific memory, the brain of a person must encode or process a piece of information or new facts into a "storable form" in order to recall it whenever required or necessary.

In the question above, the given statement signifies the encoding process.

economic

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.