I would say b. c. & d. because the question is asking how to stay safe before, not during.
DHA<span>, the 22-carbon, long-chain fatty acid found in breast milk, plays a key </span>role<span> in the structure and </span>function<span> of neural tissues, most notably those of the retina and brain. ... Intake of preformed </span>DHA<span> via either the placenta or diet is the preferred mode of </span>DHA<span> accumulation during infancy</span>
