Which of the following explanations of a decline in the gross profit margin of a firm is most probably false?

The firm's sales mix had a greater proportion of products with higher markups sold

B$.$ The firm may have intentionally reduced margins in order to increase sales volume.

The firm probably did not pass on inflationary increases in cost of sales to customers.

D$.$ The margin may have been reduced to maintain current sales level in the face of increased competition.