What was a “holler”?

How do scholars and musicians acknowledge Bach's unsurpassed mastery of composition?

a. by composing derivative works in the style of Bach b. by sponsoring festivals dedicated to his music c. by using the date of his death to mark the end of the Baroque era d. by writing biographies that claim he was the greatest composer of all time

Which of the following could create a blurry photograph?

a. a longer shutter speed b. a wider aperture c. a shorter focal length d. a low f-stop