Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Comcast founder Ralph Roberts has died at the age of 95. The founder of America's largest cable company died from natural causes on Thursday night at is home in Philadelphia. He is survived by his wife of 70 years, Suzanne Roberts their four children and eight grandchildren. His death marks the end of an entrepreneurial life which saw him establish Comcast when he bought a small cable system in Tupelo, Mississippi, in 1963. Roberts jumped head first into the fledgling cable TV industry by spending $500,000 to buy American Cable Systems. He then acquired other cable systems, changed the name of the company to Comcast and ran the company until he was aged 82The founder of America's largest cable company died Thursday nightHe is survived by his wife, their four children and eight grandchildrenHis family described Roberts as a 'kind and humble human being'Tributes have poured in from both Roberts' colleagues and friends 
 Question:_ began acquiring smaller cable systems and built the company into the nation's fifth-largest by 1988.

Ralph Roberts