Find out the pairs which are correctly matched
`{:(a.,"Cyanobacteria",1.,"Biopesticide"),(b.,"Mycorrhiza",2.,"Solubilisation of phosphate"),(c.,"Bacillus thuringiensis",3.,"Cry protein"),(d.,"Single cell protein",4.,"Rhizobia"):}`
A. a and b
B. b and c
C. c and d
D. a and d
