A couple have been trying to conceive a child for over a year without success. Recently, the man's doctor informed him that his seminal vesicles are defective. This means

• A. The man makes functional sperm but they are not delivered because he is unable to ejaculate.
• B. The man's sperm lack functional flagella
• C. The fluid needed to lubricate the man's urethra for easier sperm travel is defective.
• D. The man's semen lacks the fructose fuel needed for the sperm to swim.