Use the Following Information to Answer the Question

Use the following information to answer the question.
Big Bend National Park in Texas is mostly desert, where rainfall averages about 25 centimeters per year. Yet, it is not uncommon when hiking in this extremely arid zone to encounter mosses and ferns.
Which of the following features is most important for true mosses and ferns to reproduce in the desert?

A) that the sporophytes occupy only permanently shady, north-facing habitats
B) that the sporophytes are low to the ground, growing no taller than a couple of inches
C) that their gametophytes grow closely together
D) that the sporophytes have highly lignified vascular tissues