The Disagreement Between Spearman (Who Proposed the "G" Factor) and Raymond

The disagreement between Spearman (who proposed the "g" factor) and Raymond Cattell had to do with

A) whether all IQ tests measure the "g" factor or whether only some tests measure it.
B) whether differences in intelligence depend mostly on genetics or mostly on environment.
C) whether the "g" factor is present in all people or just in some.
D) whether the "g" factor has just one major component or two.