Which of the following breeds includes subspecies characterized by humps and droopy ears?

The chosen answer highlights the classification of cattle breeds based on their scientific taxonomy. Bos indicus and Bos taurus represent two primary species of cattle. Bos indicus, which includes breeds such as Brahman, is specifically known for its characteristic physical traits like humps and droopy ears, adapted to tropical climates. These features provide advantages in heat resistance, making them well-suited for warmer environments.

The other breeds listed do not share these specific characteristics. Angus and Hereford are primarily Bos taurus breeds, known for their solid builds and other distinct traits but lack the prominent humps and droopy ear features associated with Bos indicus. Wagyu, while renowned for its high-quality meat, also does not exhibit these traits and is derived from Bos taurus cattle. Thus, selecting Bos indicus and Bos taurus correctly identifies the breeds associated with the unique physical attributes mentioned in the question.