What is the best reason for adding this picture to Ship's Chronometer from HMS Beagle? to make the text more engaging by putting a face with Harrison’s name
to emphasize that Harrison is the most important topic in the text
to help the reader understand Harrison’s chronometer better
to encourage the reader to appreciate Harrison’s genius

to help the reader understand Harrison’s chronometer better

Explanation:

The best reason for adding a picture to Ship's Chronometer from HMS Beagle is to help the reader understand Harrison’s chronometer better.

In this case, the picture provides a visual image and interpretation of the chronometer which is important for readers to know what the chronometer looks like and therefore understand it.

idk= i don't know the answer