Solution:

Given,
- 12 points
- 7 of them are in a straight line

We need to find the number of triangles formed by joining these points.

To find the solution, we can use the following approach:

Step 1: Find the number of triangles formed by selecting any 3 points out of 12 points.
- This can be done by using the formula nC3, where n is the total number of points.
- nC3 = 12C3 = (12 * 11 * 10) / (3 * 2 * 1) = 220

Step 2: Find the number of triangles that contain the 7 points in a straight line.
- To form a triangle with these 7 points, we need to select 2 points from the remaining 5 points.
- The number of ways to select 2 points from 5 points is 5C2 = (5 * 4) / (2 * 1) = 10
- Since there are 7 points in a straight line, we can form 7 * 10 = 70 triangles with these points.

Step 3: Subtract the number of triangles formed with the 7 points in a straight line from the total number of triangles formed.
- Number of triangles formed = 220 - 70 = 150

Step 4: Find the number of triangles that can be formed by the remaining points.
- To find this, we need to subtract the number of triangles formed with the 7 points in a straight line from the total number of triangles that can be formed with all 12 points.
- Total number of triangles that can be formed with all 12 points = 220
- Number of triangles formed with the 7 points in a straight line = 70
- Number of triangles that can be formed with the remaining points = 220 - 70 = 150

Step 5: Add the number of triangles formed with the 7 points in a straight line to the number of triangles that can be formed with the remaining points.
- Number of triangles formed with the 7 points in a straight line = 70
- Number of triangles that can be formed with the remaining points = 150
- Total number of triangles formed = 70 + 150 = 220

Therefore, the correct answer is option A) 185.