Trunks drain into ducts. Therefore only ducts drain into the bloodstream. The answer can be either option a or b.
Why a? The thoracic duct allows lymph from the left side of the body and the limbs (left and right side) to drain into the bloodstream. The right lymphatic duct drains fluid from the upper regions of the body, the right side, right arm and the head.
That is the main difference between sexual and asexual reproduction. Sexual reproduction just means combining genetic material from two parents. Asexual reproduction produces offspring genetically identical to the one parent.
