Final answer:
A) By proposing rapid early expansion. The inflationary theory explains the peculiar properties of the universe by proposing rapid early expansion.
Step-by-step explanation:
The inflationary theory explains the peculiar properties of the universe described in question 2840 by proposing rapid early expansion. According to the inflationary universe model, shortly after the Big Bang, the universe underwent a period of extraordinarily rapid expansion or inflation, during which its size increased by a factor of about 10^50 more than predicted by standard Big Bang models. This rapid expansion explains why the cosmic microwave background (CMB) has the same temperature in all directions, and why the density of the universe is so close to critical density.