Which one of these explains why Boron is unable to form BF₆³⁻ ion?

Options

1. ABoron lacks the required number of valence electrons for the formation of BF₆³⁻ ion.
2. BBoron does not have the appropriate atomic size to accommodate six fluorine atoms around it.
3. CThe electronegativity difference between boron and fluorine is too large for the formation of BF₆³⁻ ion.
4. DBoron is not a halogen and therefore cannot form complex ions like BF₆³⁻.