Cleavage is division of cells in early embryo. Meroblastic cleavage is type of cleavage in which cell divides partially. It can be discoidal or superficial. It is usually found in monotremes, birds including pigeons, reptiles and certain fishes and arthropods. 

 Solution:

Correct answer is option B.

Explanation for correct option:

• Semen, also called seminal fluid, fluid that is emitted from male reproductive tract and that contains sperm cells. 46 to 80 per cent of fluid is produced by seminal vesicles.
• Semen contains citric acid, free amino acids, fructose, enzymes, phosphorylcholine, prostaglandin, potassium, and zinc.
• Semen also contains liquids that combine to form seminal plasma, which helps keep sperm cells viable. 
• The seminal plasma is rich in fructose, calcium, ascorbic acid, and certain enzymes.