A．Leaving the sunblock in a warm place.
B．Using the sunblock close to water.
C．Spreading the sunblock too thickly.
D．Storing the sunblock in bright light.
A．The sunblock became too old.
B．Guarderma used poor quality.
C．Ms.Harrison applied the sunblock incorrectly.
D．Room temperature affected the sunblock.
A．From Ms.Harrison's description of the problem.
B．Through previous reports of similar.
C．From the location of Ms.Harrison's apartment.
D．Through information associated with the product code.
A．The place of purchase.
B．A mailing address.
C．A telephone number.
D．The date of purchase.