Which one of the following activities comes under CALP ?

The correct option is Writing book reviews.

CALP stands for Cognitive Academic Language Proficiency. This concept, introduced by Jim Cummins, refers to the formal academic learning required for students to succeed in school contexts. It involves higher-order thinking skills such as analyzing, synthesizing, evaluating, and writing about abstract concepts.

Let us analyze the given options:
1. Writing book reviews: Writing a book review requires critical analysis, evaluation, structured academic writing, and abstract reasoning. Therefore, it falls under CALP.
2. Making reservations, Answering calls, and Making an appointment for a salon: These are routine daily communication tasks. They rely on BICS (Basic Interpersonal Communication Skills), which are informal, conversational language skills used in everyday social interactions.

Thus, Writing book reviews is the activity that comes under CALP.