How could one find the time of day with the instrument that Newto

Read the following passage and answer the question given below:
Sir Isaac Newton born in 1642, in Lancashire, a small village in England, was a clever child. He built the water clock and an instrument to find out time with the help of shadows. Little Newton was also interested in painting, collecting flowers and plants.
In 1665, he graduated from Trinity College. His contributions are the following: Differential and integral Calculus and Binomial Theorem. Newton also proposed the three laws of motion, i.e. An object moves only when force is applied; Every action has an equal and opposite reaction, and Every particle in the universe is attracted by all other particles. Newton devoted his life to science ‘Principia Mathematica’ and ‘Optics’ are the famous books of Newton. He passed away in 1727 at the age of 85.

A. By means of sunlight

B. By means of moonlight

C. By means of a pair of arms

D. By means of shadows

The correct answer is option 4) i.e. By means of shadows.

Explanation:

The passage is about Isaac Newton.
His inventions are also discussed in the passage.
It is clearly written in the passage that one could find time of the day using his instrument by means of shadows.

So the correct answer is : By means of shadows.