Früher … ich zu Fuß zur Arbeit. a) ginge b) ging c) gang

In Russian, the correct answer to the question is:

b) шёл

Explanation: The sentence "Früher … ich zu Fuß zur Arbeit" translates to "Раньше ... я шел пешком на работу." In this context, the correct form of the verb "to go" would be "шел" in Russian to convey the past action of walking to work.