Step 1: Match each task to its conventional method
- P. Ploidy analysis: Done by fluorescence in situ hybridization (FISH) $⇒$ (3).
- Q. Profiling DNA methylation: Measured by bisulfite sequencing $⇒$ (4).
- R. Identifying non-coding RNAs: Uses RNA sequencing $⇒$ (1).
- S. Identifying SNPs: Typically done by exome sequencing $⇒$ (2).
- T. Satellite DNA isolation: Achieved by density-gradient centrifugation $⇒$ (5). Step 2: Combine the matches
P-3; Q-4; R-1; S-2; T-5.
Therefore, the correct answer is (B).