Step 1: Understanding the context.
This question refers to the famous lesson "A Baker from Goa." In this lesson, the baker is described as someone who was not only a friend and companion but also a helper during childhood days in Goa.
Step 2: Analyzing the options.
(A) teacher: Incorrect, the passage never mentions the baker as a teacher.
(B) guide: Incorrect, the baker was not described as a guide.
(C) helper: Correct, the text clearly states that the baker was our friend, companion, and helper.
(D) friend: Incorrect, as "friend" is already mentioned in the question statement itself.
Step 3: Conclusion.
The correct answer is (C) helper, as per the lesson.