Barriers which are concerned with problems and obstructions in the process of encoding and decoding of message into words or impressions are known as:

Option 1 -> Psychological barriers relate to mental and emotional factors like prejudices, perceptions, attitudes, and emotions that affect communication.

Option 2 -> Organisational barriers arise from organizational structure, hierarchy, information overload, and complex organizational policies.

Option 3 -> Semantic barriers concern problems with language, words, symbols, and their interpretation during the encoding and decoding process of messages.

Option 4 -> Personal barriers stem from individual characteristics, personal attitudes, emotions, and behavioral factors that hinder effective communication.

Hence, Option 3: Semantic barriers -> Semantic barriers specifically deal with problems in encoding (converting thoughts into words/symbols) and decoding (interpreting words/symbols into meaning). These include issues like use of jargon, ambiguous words, language differences, faulty translations, and different interpretations of the same words, which directly obstruct the process of converting messages into words or impressions and vice versa -> correct