What was the external conflict in chapter 10 in to kill a mockingbird

It's Atticus shoots and kills a rabid dog with a shot to the head in front of his house his sharpshooter precision had been hidden from scout and Jem until the sheriff says didn't you know your daddy's the best shot in maycomb county? The children are shocked to find out their father is good at something

If we were to plug in the first option into the paragraph, it would sound like this...

The Huntington Library, located in San Marino, California, contains a significant collection of rare books and manuscripts. A visitor of the library will, however, find one of the original copies of the Gutenberg Bible, as well as first-edition copies of books by William Blake.

This cannot be the correct answer because the word however is used to contradict something that has been said previously. This sentence has no reason to be contradicted.

If we were to plug in the second option into the paragraph, it would sound something like this...

The Huntington Library, located in San Marino, California, contains a significant collection of rare books and manuscripts. A visitor of the library will, similarly, find one of the original copies of the Gutenberg Bible, as well as first-edition copies of books by William Blake.

This option is also incorrect because the word 'similarly' is used to indicate a similarity between two facts or events. But the two sentences are talking about he same thing so there is nothing to indicate similarity.

If we plug in the third option into the paragraph, it would sound something like this...

The Huntington Library, located in San Marino, California, contains a significant collection of rare books and manuscripts. A visitor of the library will, additionally, find one of the original copies of the Gutenberg Bible, as well as first-edition copies of books by William Blake.

This option can also not be the correct answer because no new factor is being introduced into the sentences.

If we plug in the first option into the paragraph, it will sound something like this...

The Huntington Library, located in San Marino, California, contains a significant collection of rare books and manuscripts. A visitor of the library will, in fact, find one of the original copies of the Gutenberg Bible, as well as first-edition copies of books by William Blake.

This is the correct answer because the sentence is using this word to emphasize the statement they are trying to make.

This means the correct answer is d )  in fact.

- Marlon Nunez