Is the study of blood spatter subjective? How reliable is the study of blood spatter?

While bloodstain pattern analysis can be a useful tool for investigators, the reliability of courtroom testimony by bloodstain pattern analysts has come under fire, particularly in the wake of a 2009 report by the National Academy of Sciences, which found the method of analysis to be "subjective rather than scientific"

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

they absorb it i think

not sure

you