Çözüldü Matrix Multiplication

https://i72.servimg.com/u/f72/19/97/10/39/matrix10.png
https://images.collegedunia.com/public/college_data/images/entrance/sample_paper/1625749201Kiran-Written-SAT Math Level 2 Practice Test 7.pdf
(The last question with no answer key or solution)

In order to multiply two matrices, the following two conditions must be met;

1. The number of columns of the 1st matrix must equal the number of rows of the 2nd matrix.
2. And the result will have the same number of rows as the 1st matrix, and the same number of columns as the 2nd matrix.

Source: https://www.mathsisfun.com/algebra/matrix-multiplying.html

Choice A is (2, 3) x (1, 2), wrong.
Choice B is (3, 2) x (2, 1), correct, and the result is a (3, 1) matrix as follows:


https://i72.servimg.com/u/f72/19/97/10/39/codeco47.gif

There is no need to check other choices on an actual exam, but only to make some practice here:
Choice C is (2, 3) x (2, 1), wrong
Choice D is (2, 1) x (3, 2), wrong
Choice E is also wrong because the result is a (2, 3) matrix.