After Mutagenesis and Screening, You Have Found a Mutant That

After mutagenesis and screening, you have found a mutant that is able to grow in soil with high salt content. Chemical analysis showed that this plant has a decreased amount of Na+ throughout the entire plant relative to normal plants. What kind of mutation do you predict this plant contains?

A) mutation affecting plasma membrane sodium channels
B) mutation affecting metallothioneins
C) mutation affecting tonoplast sodium channels
D) mutation affecting tonoplast antiporters