If Intelligent Extraterrestrials Visited Earth 475 Million Years Ago,and Then

Multiple Choice

If intelligent extraterrestrials visited Earth 475 million years ago,and then again 300 million years ago (at the close of the Carboniferous period) ,what trends would they have noticed in Earth's terrestrial vegetation over this period?
1) a trend from dominant gametophytes to dominant sporophytes
2) a trend from no true leaves to microphylls to megaphylls
3) a trend from plants that grow just above the soil surface to "overtopping" plants
4) a trend toward increased lignification of conducting systems

A) 1 and 3 only
B) 3 and 4 only
C) 1,2,and 3 only
D) 1,2,3,and 4