Lino has lactose intolerance. he has been researching non-dairy sources of calcium and learns that dark green leafy greens do contain calcium, but in some types of greens, the calcium is not absorbed because of the presence of oxalic acid. of the following types of greens, which one will have the least amount of bioavailable calcium?
a. turnip greens
b. kale
c. collard greens
d. spinach