Which situation describes a time when it would be all right to round the numbers?

a.
angelo has a 42 inch strip of balsa wood. he needs a piece that measures 21.75 inches long and another that measures 20.25 inches. he thinks of rounding the lengths to the nearest inch. he would cut a 22 inch piece and a 20 inch piece.

b.
joel needs 1.85 pints of oil for one machine and 2.65 pints for another one. he thinks of rounding the amounts to the nearest pint. he would buy 5 pints of oil to be sure he has enough.

c.
annie is buying trim for her curtains. she needs a piece that is 4.35 meters long and another piece that is 3.25 meters. she thinks of rounding the lengths to the nearest meter. she would buy 7 yards of trim.

d.
chloe needs to buy a train ticket that costs $349.50 and anther ticket that costs $112.50. she thinks of rounding the amounts to the nearest hundred dollars. she would bring $400 to buy the tickets.