The most adequate transition word to begin the third sentence would be 'although' as it helps in <u>denoting that irrespective of the plentiful numbers of cellphone users, the majority is intercepted from the associated consequences</u>. This transition word helps in bridging the gap between the ideas and helps in making the smooth transition from one idea to another irrespective of the difference. Thus, <u>option C</u> is the correct answer.
