Step 1: Understanding the institution.
The International Court of Justice (ICJ) is the principal judicial organ of the United Nations. Step 2: Analyzing the options. (A) Ruth Bader Ginsburg: She was a judge of the US Supreme Court. (B) Rosalyn Higgins: Correct — Dame Rosalyn Higgins was the first woman judge of the ICJ. (C) Fatou Bensouda: She served as the Chief Prosecutor of the ICC. (D) Navi Pillay: She served as UN High Commissioner for Human Rights. Step 3: Conclusion.
The first female judge of the International Court of Justice was Dame Rosalyn Higgins.