Which is NOT considered a risk for developing breast cancer?

Breast cancer is a malignant proliferation of epithelial cells within the terminal duct-lobular unit of the breast, driven by genetic mutations (BRCA1/2), hormonal exposure, and cumulative estrogen stimulation, with risk influenced by reproductive history, age, and lifetime hormonal milieu. Rationale: A. Being female is the strongest non-modifiable risk factor for breast cancer due to markedly higher lifetime estrogen exposure and breast glandular tissue density compared to males. The incidence in females far exceeds that in males, making this a major established risk factor. B. Breastfeeding is protective rather than a risk factor. Lactation reduces lifetime estrogen exposure by delaying ovulatory cycles and promotes differentiation of breast epithelial cells, lowering susceptibility to malignant transformation. Therefore, it decreases rather than increases breast cancer risk. C. Being tall is associated with increased breast cancer risk due to higher levels of growth factors such as IGF-1 during developmental growth phases. Increased somatic growth is linked to higher lifetime cell proliferation rates, which may increase mutation susceptibility in breast tissue. D. Age over 65 significantly increases breast cancer risk due to cumulative genetic mutations, prolonged estrogen exposure, and decreased DNA repair efficiency with aging. Most breast cancer cases occur in postmenopausal women, making advanced age a major non-modifiable risk factor.