35. In the genetic self-incompatibility (SI) system of angiosperms, which molecular mechanism most commonly prevents self-fertilization? (A) RNA-directed DNA methylation blocking pollen tube growth. (B) Ubiquitin-mediated degradation of incompatible pollen proteins. (C) CRISPR-like genome editing in the pollen grain before fertilization. (D) Epigenetic silencing of self-recognition genes in the ovule. (E) Caspase-dependent apoptosis of self-pollen after stigma contact.