In the late 1990s, it was announced that the expansion of the universe is accelerating. what does this imply from the perspective of the big bang?

A force exists that we knew nothing about that causes the acceleration.

Explanation:

In 1998, scientists observed from distances of supernovae in remote galaxies that the enlargement of the universe is accelerating. Besides, there is evidence that suggests that the universe is  flat and infinite, as well as accelerating in its expansion. In that respect, the force suspected to be responsible for this is called dark energy.

answer; i believe that the correct answer is (d); // supercontinent