Answer: Mr. Lang's fundraiser was a success. Because of his teenage daughter's computer skills, his website received a ton of donations. People loved it. Her sleek design and funny videos attracted a large crowd.
Step-by-step explanation:
The option which avoids fragments by presenting the information clearly and correctly is option D "Mr. Lang's fundraiser was a success. Because of his teenage daughter's computer skills, his website received a ton of donations. People loved it. Her sleek design and funny videos attracted a large crowd".
Option A is incorrect as it contained many fragments and made the sentences short and incomplete.
Option B is wrong as the lat sentence "attracting a large crowd" shouldn't be written as a sentence on its own. There were fragments which resulted in the information not to be presented clearly.
Option C is incorrect as a comma should be after "Because of his teenage daughter's computer skills" rather than a full stop. A comma after the phrase would have presented the information better and clearly.
The correct option is D.