Della cried sadly because...
A. she had no money
B. her money ia not enough to buy present for husband
C. her husband could not buy any Christmas present for her
D. she cut her precious hair
E. her money was gone and only a dollar and eighty seven cents left

B, her money is not enough to buy a present for her husband.

Explanation:

This happens in the beginning of the story, The Gift of the Magi.  Della counted her money left over from buying meat and other foods.  She only had $1.87 left to buy her husband a gift.  The next day was Christmas.

She cries at the end, too but not sadly.  Because her husband had not rejected her for cutting her long beautiful hair.  She had it cut and sold to buy her husband a Christmas gift, a chain for his watch.  The irony is that her husband sold the watch to get Della be-jeweled combs for her long hair, which she could no longer use until her hair grew back.

to get a better life and have children that they get to see grow up better than they did.