The correct option is D 3.7
One complete bar represents one whole.
One bar is divided into 10 equal parts, so each part is worth one-tenth.
There are 3 complete bars which is equivalent to 3 wholes.
7 parts out of 10 are shaded in the 4th bar which is equivalent to seven-tenths.
Seven-tenths = 0.7
So, decimal number for the entire grid = 3 + 0.7 = 3.7