Can we draw the following hypothesis from the context (see options)?

Context:

A missed call is a telephone call that is deliberately terminated by the caller before being answered by its intended recipient, in order to communicate a pre-agreed message without paying the cost of a call. For example, a group of friends may agree that two missed calls in succession means "I am running late". The practice is common in South Asia, the Philippines and Africa.

Hypothesis: Many calls are deliberately terminated in Africa.
Select from: (a). Yes (b). It's impossible to say (c). No
(a).