What do we mean by inflation?
A)the expansion of the universe that we still observe today
B)the sudden release of photons when a particle and antiparticle annihilate one another
C)a sudden and extremely rapid expansion of the universe that occurred in a tiny fraction of a second during the universe's first second of existence
D)quantum fluctuations by high speed,relativistic particles in a state of false vacuum that caused disturbances in the space-time continuum leading to the process described in the question to which this answer refers

Question

Quizplus · Accepted Answer

Inflation is the sudden and extremely rapid expansion of the universe that occurred in a tiny fraction of a second during the universe's first second of existence. This theory was proposed to explain several observed characteristics of the universe, including its homogeneity and flatness.

The other options describe different phenomena: 
A) Expansion of the universe that we still observe today is known as cosmic expansion. 
B) The sudden release of photons when a particle and antiparticle annihilate each other is known as annihilation. 
D) Quantum fluctuations by high-speed, relativistic particles in a state of false vacuum that caused disturbances in the space-time continuum leading to the process described in the question to which this answer refers is known as quantum fluctuation.

What Do We Mean by Inflation