What sparked international concern during the Al Jazeera journalists' deaths?

The deaths of Al Jazeera journalists sparked international concern primarily because these incidents highlighted significant issues surrounding freedom of the press. When journalists are killed, especially under contentious circumstances related to their reporting, it raises alarm about the safety and rights of media professionals around the world. This situation calls attention to the threats faced by journalists, including censorship, violence, and suppression of free expression. The global reaction often includes calls for accountability and protection for journalists, as their work is essential for a functioning democracy and for informing the public about important issues.

In contrast, the other options—climate change, immigration policies, and infant mortality rates—while serious global issues, do not directly relate to the specific context of the deaths of journalists and their implications on press freedom and safety. This makes the emphasis on freedom of the press particularly relevant in the discussion of these tragic events.