Which piece of evidence suggests a 'nurture' contribution to left-handedness
A)The proportion of left-handers is relatively constant across cultures.
B)Ultrasound scans show that 10% of fetuses suck their left thumb.
C)Left-handedness is less prevalent in collectivist than in individualist societies.
D)Left-handedness seems to transmitted by a gene on the X chromosome.

Question

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C) suggests a 'nurture' contribution because it indicates that societal factors (collectivism vs. individualism) can influence the prevalence of left-handedness, implying environmental or social influences rather than purely genetic ones.

Which Piece of Evidence Suggests a 'Nurture' Contribution to Left-Handedness