The correct answer is 4. semiology because:
Semiology is the study of signs, symbols, and how they create meaning. It systematically studies how signs function in communication. It was introduced by Ferdinand de Saussure as part of linguistics and has expanded into many disciplines such as anthropology, sociology, and media studies.
Why the other options are incorrect:
Semantics: Focuses on the meaning of words and sentences, not the overall function of signs.
Scriptoria: Refers to rooms in medieval monasteries where manuscripts were copied, not the study of signs.
Sismography (commonly spelled "seismography"): Is related to measuring and recording earthquakes, not signs.
Hence, semiology is the only option that refers to the science of studying the function of signs.