Please Read the Following Scenario to Answer the Following Question(s)

Multiple Choice

Please read the following scenario to answer the following question(s) .
While working with cultured mouse cells, a researcher unknowingly treated the cells with a mutagen that causes the deletion or insertion of individual nucleotides in DNA. Subsequently, she isolated and cultured a single cell from this group. She noticed that the progeny of this cell were not producing a certain protein and that this affected their survival.
-The mutation that resulted from her accident was probably ______.

A) an amino acid substitution
B) one that changed the triplet grouping of the genetic message
C) an error in translation
D) a loss in regulation of gene expression