A is fourth from the left end. M is second to the right of A; and R is second from the left end. M is fourth from the right end. Only two people stand between M and B. What is the total number of people in the row?

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**Solution:**

1. From Statement (I):
   - R is 2nd from the left.
   - A is 4th from the left.
   - M is 2nd to the right of A, so M is at position 6 from the left.

2. From Statement (II):
   - M is 4th from the right.
   - Two people stand between M and B, but B's exact position is not known.

3. Combining both statements:
   - M's position from left = 6
   - M's position from right = 4

4. Total number of people in the row = (Position from left) + (Position from right) - 1
   $$= 6 + 4 - 1 = 9$$

Thus, the total number of people in the row is 9.

**Answer:** Data in statements I and II together is sufficient to answer the question.

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