15. Kathryn told Daniel to prepare a saturated soap solution with powdered laundry detergent.
What should Daniel do? He should
A. alternately mix any amount of powdered laundry detergent and water while
continuously stirring the solution
B. measure a particular amount of powdered laundry detergent and mix it to a fix amount
of water and stir the solution well
C. mix an unlimited amount of powdered laundry detergent to any amount of water and
stir the solution until all powder is dissolved
D. add gradually small amount of powdered laundry detergent to a specific amount of
water and stir the solution until no more powder will be dissolved​