Based on "Thomas Edison: The Master of Improvement,” which statement best describes why Edison succeeded in inventing a usable lightbulb? He was highly educated in engineering, physics, and mechanics.
He was a talented inventor who naturally knew how to build things.
He was very determined and persistent in overcoming obstacles.
He was inspired and challenged by his mother’s high expectations.

He was very determined and persistent in overcoming obstacles.

Explanation:

in my opinion, anyone should be allowed to marry as long as it's not going against any laws. though i kind of contradict myself because i know that in some states and countries, gay marriage isn't legal yet- hopefully you get my point.

the sentence that best describes the tone of the passage from the radio broadcast compared to the passage from the book is b. the radio broadcast has a more surprised tone.

consider the text evidence: in the passage from the book, the description is more matter-of-fact. it is simply describing the things resembling little grey snakes, but there is no urgency in the description. on the other hand, in the passage from the radio broadcast, there is definetely urgency (you can tell from the expression used, "good heavens", which clearly indicates surprise.)