Step 1: Understanding the Question.
Section 66A of the Information Technology Act, which penalized offensive online content, was struck down by the Supreme Court in 2015 as it violated Article 19(1)(a) (freedom of speech) while not satisfying the reasonable restrictions under Article 19(2). The landmark case was Shreya Singhal Vs State of U.P.
Step 2: Conclusion.
Thus, Shreya Singhal Vs State of U.P. is the correct case, making (b) the applicable answer.