Question

once luxury items, smartphones have become ubiquitous, resulting in major changes to how we communicate. this means that smartphones are... found everywhere and commonly seen. only used by certain age groups. very rare and hard to find. found only in certain parts of the world.

Explanation:

The word "ubiquitous" means existing or being everywhere at the same time, or very common. The sentence says smartphones have become ubiquitous, so we need to find the option that matches this meaning. The first option "found everywhere and commonly seen" aligns with the definition of ubiquitous. The other options ("only used by certain age groups", "very rare and hard to find", "found only in certain parts of the world") are contrary to the idea of being ubiquitous.

Answer:

A. found everywhere and commonly seen.