Question: What platform was the Mercedes-Benz GLK's 2008 debut competitor based on?

Context paragraphs:
The Order of Odd-Fish: The Order of Odd-Fish is a 2008 debut children's novel by James Kennedy.  The book was first published on August 12, 2008 through Delacorte Books for Young Readers, and focused upon a young girl discovering her true identity.  "The Order of Odd-Fish" was named a "Smithsonian Notable Books for Children" for 2008, and in 2013 the character of Ken Kiang was named by Daniel Kraus as one of the "most evil characters in literature".

Under the Bed (album): Under the Bed is the 2008 debut album by Josh and the Empty Pockets.  In an interview with Phil Ponce on "Chicago Tonight", Josh explains that the debut album is about growing up and that the title "Under the Bed" comes from the lyrics “where have the monsters under my bed gone” on one of the album's songs.  The album was critically well received, and its tracks were featured on several television programs on Nickelodeon TV channel.  In support of the album, the band released a single, "Fall Right Now", which reached #11 on the FMQB Adult Contemporary Chart.

Mercedes-Benz GLK-Class: The Mercedes-Benz GLK (codename X204) is a compact luxury crossover SUV that went on sale from the autumn of 2008 after its public debut at the 2008 Beijing Auto Show alongside the competing Audi Q5.

Mercedes-Benz CLA-Class: The Mercedes-Benz CLA-Class is a compact car developed and manufactured by Mercedes-Benz, based on the platform of the and W246 B-Class compact cars, formally launched at the January 2013 North American International Auto Show.  The vehicle was previewed as the 2012 Concept Style Coupe at various international locations.  The CLA is Mercedes' first ever front-wheel drive three-box saloon car.

Audi Q5: The Audi Q5 is series of compact luxury crossover SUVs produced by the German luxury car manufacturer Audi from 2008, The original first-generation ("Typ 8R") model was the third member of the "B8" family to be released after the Audi A5 and fourth-generation A4, all being based on the Audi MLB platform.  The second generation Q5 ("Typ 80A") debuted in 2016 and shares the Audi MLBevo platform with the corresponding "B9" versions of the A4 and A5.

Mercedes-Benz SLK-Class (R170): The Mercedes-Benz R170 SLK-Class was the first generation of compact luxury roadsters produced by Mercedes-Benz between 1996 and 2004.  SLK stands for the company’s design mission to create a "sportlich" (sporty), "leicht" (light) and "kurz" (compact) roadster, and is based on a shortened platform of the W202 Mercedes C-Class.  It was replaced by the Mercedes R171 SLK in 2005.

Tammie Leady: Tammie Leady (born 11 August, Port Arthur, Texas) is a certified personal trainer and a fitness and figure competitor based in Atlanta, Georgia.  She is also a fitness model who has appeared in a number of magazines, including "Flex", "American Curves" and "Muscle & Fitness".  As a personal trainer, she writes in various columns about improving ones physical health and well-being.

WF trac: The WF trac is the current version of a tractor originally known as MB trac and developed by Mercedes-Benz which was based on their Unimog platform.  It was built by Mercedes-Benz between the years 1973 and 1991.  At its time its design and concept was revolutionary, featuring four identical wheels, high road speeds and powerful engines.

Nights in Rodanthe: Nights in Rodanthe is a 2008 American romantic drama film.  It is an adaptation of Nicholas Sparks' 2002 novel "Nights in Rodanthe".  The film stars Richard Gere and Diane Lane in their third screen collaboration after "Unfaithful" (2002) and "The Cotton Club" (1984).  The film is rated PG-13 by the MPAA for "some sensuality" and was released on September 26, 2008.  It was filmed in the small seaside village of Rodanthe, the northernmost village of the inhabited areas of Hatteras Island as well as North Topsail Beach, North Carolina.  The film's soundtrack features "Love Remains the Same", a song written by Gavin Rossdale for his 2008 debut solo album, despite the fact that it does not appear in the film.

Mercedes-Benz C-Class (W204): The Mercedes-Benz C-Class (W204) is a range of entry-level luxury cars which were produced by the German automaker Mercedes-Benz from 2007 (as a 2008 model) to 2014.  It was the successor to the W203 and was eventually replaced by the W205 in 2014, though W204 coupes were still produced for the 2015 model year.  The W204 was produced in sedan (saloon), station wagon (estate), and coupé versions.  The coupé was released in 2011 alongside the facelifted W204 sedan and station wagon.  The majority of C-Class versions have rear wheel drive (RWD) but some models are available with all-wheel drive (AWD).  The Mercedes E-Class coupe (C207) also uses the W204 platform.

Supporting paragraphs: Mercedes-Benz GLK-Class Audi Q5
Answer: the Audi MLB platform