Mr. kim's eighth grade science class was trying to maintain a classroom garden. unfortunately, the weeds were taking over. mr. kim saw a weed killer advertised on tv which said that one application would kill the three most common garden weeds and would be effective for at least one month. mr. kim bought some and applied it to the classroom garden. his students kept track of the weeds growing in their garden. what could mr. kim's students infer from their data? a) the weed killer was most effective on lespedeza and dandelion. b) the weed killer was effective on the plantain for three weeks. c) the weed killer was not effective on any of the weeds for one month. d) the weed killer wiped out the dandelions and plantain for over one month.