In seedless plants, haploid gametophytes are produced
a) diploid spores that undergo mitosis.
b) haploid spores that undergo meiosis.
c) diploid spores that undergo meiosis.
d) haploid spores that undergo mitosis.

The correct answer would be D) haploid spores that undergo mitosis.

Seedless plants such as ferns, horsetails, whisk ferns et cetera shows alternation of generation in their life-cycle that is, haploid gametophyte and diploid sporophyte phase.

Diploid sporophyte produces haploid spores with the help of meiosis.

These haploid spores divide with the help of mitosis to produce haploid gametophyte (male and female).

These gametophytes fertilize to produce a diploid zygote which divides and mature into a diploid sporophyte.  

Thus, haploid gametophytes are produced from haploid spores that undergo mitotic divisions.

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it would affect precipitation by causing flooding in some areas of the world due to climate increasing, causing the glaciers in the northern and southern pole of our planet to melt.

i wish you would have provided choices to simplify it and allow me to give an exact answer.