What Was a Major Challenge That Early Land Plants Faced

What was a major challenge that early land plants faced, and bryophytes still face, in adapting an ancestral aquatic reproductive cycle to land?

A) Successful fertilization by free-swimming sperm is rare, because it generally requires continuous water films connecting male and female gametophytes.
B) Few spores can survive dispersal in air.
C) Plants dependent on surface water may have dried out and died before completing their life cycles.
D) Gametophytes need environmental water to undergo meiosis.