Which cell analysis technique is used to rapidly analyse single cells or particles as they flow through single or multiple lasers while suspended in a buffered salt-based solution?

Correct option is B

Flow cytometry is the technique used for analyzing the physical and chemical characteristics of particles in a fluid as they pass through at least one laser.
It allows simultaneous multiparametric analysis of the physical and/or chemical characteristics of single cells flowing through an optical and/or electronic detection apparatus.
Other options:
 Mass spectroscopy: Used for determining the masses within a sample or the composition of a sample by ionizing chemical compounds.
 Electrochemical analysis: Involves the study of chemical properties using electricity and how chemicals react at the interface of an electrode, usually more focused on reactions than cell analysis.
 Multiple displacement amplification: A method of amplifying tiny amounts of DNA for genetic analysis, not involving cell flow or lasers.