Answer:
This researcher is studying this practice from a D. semiotic approach.
Explanation:
Semiotic can be defined as the study of signs and symbols, and how they function and convey meaning. As a matter of fact, a sign is anything that conveys a meaning, and it can be communicated or interpreted through any of the five senses. In this particular case, the researcher is analyzing how this specific company transformed the letter "I" into a symbol of identity. Therefore, the researcher is studying this matter from a semiotic point of view.