What is one of the potential dangers of using a debit card for purchases? O A. an overdraft of your checking account
O B. paying cash for merchandise
O C. you do not have a check stub
O D. you can't spend more than 20% of your earnings​

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have