Respected teacherWhy option D is correct and not option C and if B &C both are correct then why not option A ?Thanks in advance for the answer..

Hai Navdeep,
The mentioned compounds are salts and metabolic waste compounds present in blood
They are filtered in to the tubular filterate at glomerulus- Glomerular Filteration (option B).
Tubular secretion also occurs for compounds like urea and drugs like hippuric acids.
Also go through the two images attached for better understanding.