Step 1: Identifying the theme of the book.
‘The City and the Grassroots’ deals with urban social movements, collective action, and the role of cities in shaping social change.
Step 2: Associating the theme with the author.
Manuel Castells is a renowned sociologist known for his work on urban sociology, social movements, and the network society. This book is one of his most influential contributions to the study of urban social movements.
Step 3: Elimination of other options.
Michel Foucault focused on power, discourse, and knowledge.
Charles Tilly is known for theories of collective action and social movements, but not this book.
Veena Das is associated with anthropology and sociology of violence and everyday life.
Step 4: Conclusion.
Therefore, the correct author of ‘The City and the Grassroots’ is Manuel Castells.