Why is carbon is considered tetravalent?

why is carbon is considered tetravalent?
since it has four electrons in its outermost orbital, it needs four more electrons to complete its octet.
since it has two electrons in its outermost orbital, it needs four more electrons to complete its octet.
since it has four electrons its outermost orbital, it can donate four electrons to complete its octet.

connect the batteries in series and hope

the following is queen elizabeth’s purposes:

- to encourage the parliament that the technique of picking successors to the seat based merely on birthright needs to be reviewed.

- (not) to convince the parliament that her kid should not be measured as a likely choice for heir to the english power.

- to persuade the parliament that merely since she has a child does not assure that the kid will be a capable leader.

- to sway the parliament how shattering it could be if they proceeded discourteously concerning her or her child.