Question

sentinel has the same or almost the same meaning as:
o militant
o watch
o casualty
o constituent

Explanation:

The word "sentinel" means a person or thing that watches over something. "Watch" can also imply the act of observing or guarding, which is similar in meaning. "Militant" refers to a combative person, "casualty" is a victim of an accident or war, and "constituent" is a part of a whole or a voter.

Answer:

B. watch