To determine which shrubs are valued for ornamental bracts, let's analyze each option:
- Euphorbia pulcherrima: Commonly known as the Poinsettia, this plant is renowned for its bright red, pink, or white bracts, which are often mistaken for flower petals. The true flowers are small and yellow, located in the center of the bracts. It is indeed valued for its ornamental bracts.
- Bougainvillea spectabilis: This is another plant known for its vividly colored bracts, which can be purple, red, or pink. The actual flowers are small and surrounded by these large, attractive bracts, making it a popular ornamental plant.
- Juniperus horizontalis: This species is a low-growing coniferous shrub primarily valued for its foliage rather than bracts. It is not known for having ornamental bracts.
- Mussaenda frondosa: This plant has large, colorful bracts that can be white or cream, which surround tiny flowers, making it an attractive ornamental choice.
Now, matching these observations with the given options:
(B), (C), and (D) only: This option includes Juniperus horizontalis, which doesn't have ornamental bracts.
(A), (B), and (D) only: This option correctly identifies plants known for their ornamental bracts: Euphorbia pulcherrima, Bougainvillea spectabilis, and Mussaenda frondosa.
(A), (B), and (C) only: Similarly, including Juniperus horizontalis, which is incorrect.
(A) and (C) only: Again, includes the incorrect plant Juniperus horizontalis.
Hence, the correct answer is (A), (B), and (D) only, as these shrubs are all valued for their ornamental bracts.