In a matrilineal society, a. men take leadership over each aspect of a family b. women are in charge of all aspects of family leadership c. ancestry is traced through male heritage d. ancestry is traced through female lines

D, ancestry is traced through female lines

True blindness may be caused by trauma to the eye, severe conjunctivitis due to  ibr (infectious bovine rhinoceros) or pink eye or other infections, leptospirosis, lead poisoning, selenium toxicity, fungal infections, vitamin a  deficiencies, rabies, vitamin b12 deficiency, neoplastic of the orbit or  conjunctiva, cataracts, congenital malformations, etc.