Your Rich Uncle, an Eccentric Botanist, Has Died

Your rich uncle, an eccentric botanist, has died. The will states: "Just like my favorite plants, I keep my wealth buried underground." Where do you dig for his treasure?

A) In the peanut field. Legumes have root nodules which house symbiotic ants that harvest honey, a nutritional "treasure".
B) In the herbaceous perennial bed. Perennial stems die each fall, but underground nutrient stores provide energy for regrowth each spring.
C) In the annual plant bed. Annuals store nutrients in extensive underground root systems that allow them to regrow each year.
D) Dig up the roots of the mistletoe plants, which store large quantities of water.