The correct sentence is C. Neither the umbrellas nor the tree protects us from the sun.
In compound subject, the nearest subject form is the form used by the verb. In this case, tree is in singular form thus, the verb is in singular form.
Should be:
Bill or Rudy HAS called twice for Tim.
Either Clara or her sisters HAVE borrowed my scissors.
Peggy and Sydney ARE waiting for you.
The hottest place on earth is the inner core, which is in the centre, and is located beneath the crust, mantle, and outer core.
hope this helps
Compromise is when two parties gain and lose something to come to a consensus.