Answer:
The rectangle which is similar to the given rectangle is:
B) rectangle with a length of 44 and a width of 11.
Explanation:
Two figures are said to be similar if the ratio of each of the corresponding sides of the two figures are equal.
Given a rectangle with a length of 36 and a width of 9.
A)
rectangle with a length of 30 and a width of 6.
The ratio of the corresponding sides is given by:

since, the two ratios are not equal.
Hence, the figure are not similar.
B)
rectangle with a length of 44 and a width of 11.
The ratio of the corresponding sides is given by:

since, the two ratios are equal.
Hence, the figure are similar.
C)
rectangle with a length of 64 and a width of 8.
The ratio of the corresponding sides is given by:

since, the two ratios are not equal.
Hence, the figure are not similar.
D)
rectangle with a length of 72 and a width of 12.
The ratio of the corresponding sides is given by:

since, the two ratios are not equal.
Hence, the figure are not similar.