The terms ‘Event Horizon’, ‘Singularity’, `String Theory’ and ‘Standard Model’ are sometimes seen in the news in the context of

Event Horizon and Singularity are terms closely associated with Black Holes, which are crucial for understanding the Universe.

The Standard Model in physics is a theory that attempts to explain the fundamental forces and particles of the universe.

String Theory is a theoretical framework that attempts to unify all fundamental forces and particles in the universe using vibrating strings.

These concepts are primarily used in the context of observing and understanding the Universe.

Hence, option A is the correct answer.