Which sentence describes the main idea of this passage?

every so often, i consider simplifying my life and getting rid of my landline phone so that i just have a cell phone. it just seems silly to have two phones, yet something always stops me. some little voice in my head reminds me that a landline and a cell phone have very different advantages. for example, cell phones may be fully portable, but i still haven't found one that's comfortable to talk on for long periods of time. also, cell phone reception can cut in and out or even be lost completely. my landline is a solid, quality phone that gets excellent reception. also, landlines do not need to be charged every day. friends warn me that landlines are for dinosaurs, but i don't care.

a.
landlines have become outdated because of cell phones.
b.
cell phones are the future of wireless communication.
c.
landlines and cell phones both have advantages and disadvantages.
d.
technology keeps on changing over time, and people need to change with it.

[1] nothing that comes from the desert expresses its extremes better than the unhappy growth of the tree yuccas. tormented, thin forests of it stalk drearily in the high mesas, particularly in that triangular slip that fans out eastward from the meeting of the sierras and coastwise hills. the yucca bristles with bayonet-pointed leaves, dull green, growing shaggy with age like an old [5] man's tangled gray beard, tipped with panicles of foul, greenish blooms. after its death, which is slow, the ghostly hollow network of its woody skeleton, with hardly power to rot, makes even the moonlight fearful. but it isn't always this way. before the yucca has come to flower, while yet its bloom is a luxurious, creamy, cone-shaped bud of the size of a small cabbage, full of sugary sap. the indians twist it deftly out of its fence of daggers and roast the prize for their [10] own delectation why does the author use the words "bayonet-pointed" (line 4) and "fence of daggers" (line 9) to describe the leaves of the yucca tree? . to create an image of the sharp edges of the plant to emphasize how beautiful the plant's leaves are to explain when and where the plant grows to show how afraid the author is of the plant