TOEFL Reading: ETS-TOEFL阅读机经 - 685KD9HIYFU1C6M_L$

Why does the author mention a soap advertised as "99 and 44/100ths percent pure"? A. To make the point that the earliest product advertisements were very sophisticated B. To support the claim that advertising was effective in building demand and customer loyalty C. To suggest that the claims made by soap manufacturers were obviously untrue D. To contrast the ways in which soap and photographic processing were marketed