The correct option is C Corpus luteum
Corpus cardiacum
The Corpus cardiacum is an organ present in the nervous system of some insects which helps in the secretion of the brain hormones. Examples include Arthropoda.
Corpus luteum
After ovulation, the granulosa cells and interstitial cells of the Graffian follicle form a mass of large and yellowish conical cells called the corpus luteum. It functions as an endocrine gland and secretes hormones like estrogen, progesterone, relaxin, and inhibin. It is called a temporary endocrine organ as it is formed only to maintain the pregnancy.
Corpus allatum
Corpus allatum is an endocrine gland present in insects that secrete juvenile hormones responsible for metamorphosis. Examples include Arthropoda.
Pineal gland
The pineal gland is an endocrine gland in the brain of vertebrates that secretes melatonin responsible for the sleep-wake cycle or circadian rhythm.
Final answer
(B) Corpus luteum