At the end of meiosis i each cell has the number of chromosomes as were in the original cell
a) three times
b) twice
c) half
d) four times

The correct answer  for the blank is- C) Half.

Meiosis is a type of cell division ( in sexually reproducing organisms) that produces 4 haploid reproductive cells ( also called gametes) from a single diploid parent cell.

It is primarily divided into meiosis I ( reductional division) and meiosis II ( equatorial division).

Meiosis I starts with one diploid parent cell and ends with the formation of two haploid daughter cells, having half the number of chromosomes in each cell as compared to parent cell.

Meiosis II starts with two haploid parent cells and ends with four haploid daughter cells.

Thus, C) is the right answer.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.