A student wants to cross a pink-flowered plant with a white-flowered plant of the same species. Which procedure is most likely to ensure the production of seeds that contain the genetic material of both plants?

a} Plant the seeds of pink-flowered and white-flowered plants in the same hole.
b} Touch the stamen of a pink flower to the stigma of a white flower.
c} Put an egg from a white flower in a test tube with an egg from a pink flower.
d} Plant pink-flowered and white-flowered plants within one meter of each other.