Choice B is the best answer. The convention being tested is the use of punctuation within a sentence. This choice correctly uses a dash after "cooperation" to pair with the dash after "that" to separate the supplementary element "assuming solar panel installers' cooperation" from the rest of the sentence. #SATPractice

Choice D is correct. The area of a rectangle is given by bh, where b is the length of the base of the rectangle and h is its height. Let x represent the length, in units, of the base of rectangle ABCD, and let y represent its height, in units. Substituting x for b and y for h in the formula bh yields xy. Therefore, the area, in square units, of ABCD can be represented by the expression xy. It's given that the length of each side of EFGH is 6 times the length of the corresponding side of ABCD. Therefore, the length, in units, of the base of EFGH can be represented by the expression 6x, and its height, in units, can be represented by the expression 6y. Substituting 6x for b and 6y for h in the formula bh yields (6x)(6y) which is equivalent to 36xy. Therefore, the area, in square units, of EFGH can be represented by the expression 36xy. It's given that the area of ABCD is 54 square units. Since xy represents the area, in square units, of ABCD, substituting 54 for xy in the expression 36xy yields 36(54), or 1,944. Therefore, the area, in square units, of EFGH is 1,944. #SATPractice

Choice D is the best answer. The convention being tested is punctuation use between two main clauses. In this choice, a colon is correctly used to mark the boundary between one main clause ("goats are notoriously indiscriminate") and another main clause ("they will devour all kinds of shrubs and weeds") and to introduce the following explanation of goats' nondiscriminatory behavior when it comes to what they eat. #SATPractice