An egg.

“A. one of these answers”

Trump was 8 years old when John was ten.

                                           Trump                                    John                                               Jacob
                                                  2                                               4=2xTrump’sAge                 23
+6                                            8                                            10                                                     29
+9                                         17                                            19                                                     38=2xJohn’s Age

Select a fruit from the box with the label “Peaches and Oranges”.
Case 1: If it is an orange, then the box with the label “Oranges” contains peaches (because peaches can’t be in the box labeled “Peaches”) and the box with the label “Peaches” will contain peaches and oranges.
Case 2: If it is a peach, then the box with the label “Peaches” contains oranges (because oranges can’t be in the box labeled “Oranges”) and the box with the label “Oranges” will contain peaches and oranges.

A tooth.

It is possible only if the name of the horse is ‘Sunday’.

If the time starts with the first cut, then 54 seconds.

Hold the rope as in the pic and pull your hands apart. The knot is shifted to the rope.

The letter ‘r‘.