There are two examinations rooms A and B. If 10 students are sent from A to B, then the number of students in each room is the same. If 20 candidates are sent from B to A, then the number of students in A is double the number of students in B. The number of students in room A is:

**Option A):**

200**Option B):**

80**Option C):**

100**Option D):**

150

**Correct Answer is Option C):**

100