When land environments became drier millions of years ago?

Question

a. forests of pteridophytes began to disappear.

b. mosses evolved vascular tisse.

c. mosses and ferns no longer required water for reproduction.

d. ferns developed pollen.

Answer 1

a. forests of pteridophytes began to disappear.

Pteridophytes used to be dominant members of Carboniferous swamp forests.

Why the other answers are wrong: Mosses did not evolve vascular tissue, mosses and ferns still require abiotic vectors for reproduction, and ferns did not evolve pollen.