Vanessa is conducting an experiment to see how exposure to different types and amounts of light affects the growth of plants. her results are shown in the data table below. light source type of plant growth (centimeters) sunlight pea plant 1.09375 . partial sunlight daffodil 0.81250 . artificial light lima bean plant 0.78125 . no light sunflower 0.18750 . did vanessa make an error in the design of her experiment? a. no; vanessa designed her experiment correctly. b. yes; there are too many manipulated variables in her experiment. c. yes; plants cannot grow in artificial light. d. yes; vanessa should have measured with customary units.