Which statement best describes the earliest ancestors of plants?
a. they had no competition.
b. they were vascular.
c. they had seeds.
d. they lived in water.

They lived in water.

Explanation:

The earliest ancestors of plants lived in water. Having seeds, having no competition and and having seeds are modern characteristics of the plants.

The earliest characters of the plants is that they lived in the water. Previously the planet was covered with water and the plants was limited up to water only.

They needed water for fertilization. After a long-long time they moved towards land and angiosperm and gymnosperm evolved.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.