Refer to the given Venn diagram and select the correct option regarding P, Q, R and S.
P | Q | R | S | |
A | Bryophyllum | Mimosa | Sunflower | Morning glory |
B | Ivy | Mustard | Marigold | Wheat |
C | Canna | Smilax | Calophyllum | Ficus |
D | Flax | Maize | Sorghum | Tomato |