The problems and hindrances in the process of encoding and decoding of message into words or impressions are known as:

Semantic Barriers

The correct answer is Option (3) - Semantic Barriers.

Semantics is the branch of linguistics dealing with the meaning of words and sentences. Semantic barriers are concerned with problems and obstructions in the process of encoding and decoding of message into words or impressions. Normally, such barriers result on account of use of wrong words, faulty translations, different interpretations, etc. These are :
(i) Badly expressed message
(ii) Symbols with different meanings
(iii) Faulty translations
(iv) Unclarified assumptions
(v) Technical jargon
(vi) Body language and gesture decoding