Answer:
Second Option: 36 feet
Step-by-step explanation:
Based on the given information we can conclude that this is a simple <u>Trigonometry</u> case based on a Right-Triangle and Pythagoreann Theorem.
Right triangles refer to the triangles whose one angle is always 90° and the side opposite the right angle is called the Hypotenuse. Now, Pythagorean theorem states that the summation of the two squared sides of a right triangle gives the hypotenuse squared, and is expressed as:

where
: is the hypotenuse
: is one triangle side
: is the other triangle side
where the 90° angle is formed between
and
.
Now, from the given information we can see that the right angle is formed between the perpendicular to the ground 30-foot silo and the parallel to the ground 20-foot shadow. <u>So let us plug in the values and solve for the hypotenuse which is the measure between the tip of the shadow to the top of the silo</u>:

So we can see that it is closest to the Second Option of 36 feet.