two matrices are comfortable for multiplication if:

no of a row of A is equal to no of columns of B

no of columns of A is equal to no of a row of B

both matrix are of same order

none

Two matrices A and B are said to be conformable for multiplication. If the number of columns in A is equal to the number of rows in B.
according to the defination of matrix option B will be consider as correct option
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?additional information
If two matrices have the same dimensions (number of rows and number of columns), they are conformable for addition