Definition: In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.
Input: Question: Did the driver who replaced Sacks in 1989 ever win the NASCAR Cup Series? Passage:In 1987, he signed on to drive the No. 50 Pontiac for the Dingman Brothers, where he struggled with qualifying for each race. Three-quarters of the way through 1988, Sacks left the team to drive for Buddy Baker's team, the No. 88 Oldsmobile. Despite posting two top ten finishes in the first ten races of the 1989 season, Sacks was replaced by rookie Jimmy Spencer. Sacks was unemployed for a brief period, then joined on with Tom Winkle's No. 48 Pontiac for most of the season, joining with Hendrick Motorsports for the Autoworks 500 at Phoenix International Raceway as part of the driving team gathering in-race footage for the "Days of Thunder" movie.
Links: a. 1989 NASCAR Winston Cup Series b. Jimmy Spencer c. Oldsmobile d. 1989 NASCAR Winston Cup Series
Output:
b