When (S)-4-methyl-2-pentanol is treated with tosyl chloride (TsCl) in pyridine, followed by sodium cyanide (NaCN) in DMF, the name of the major product after this two-step sequence is:
a) 4-methyl-2-pentene
b) 4-methyl-2-pentanone
c) 4-methyl-2-pentanonitrile
d) 4-methyl-2-pentanoyl chloride
