The correct response is: The jeweler does a calculation to find the number of beads he buys and compares the amount to 19,000.
The jeweler calculates the total number of beads he purchases by multiplying the number of boxes (48) by the number of beads in each box (400), resulting in 19,200 beads. He then compares this amount to the 19,000 beads he needs, concluding that he has enough beads.