Which expressions are equivalent to −2.1 (−5.9) (−3.7)−2.1 (−5.9) (−3.7) ? select each correct answer.
a. −(2.1 5.9) (−3.7)−(2.1 5.9) (−3.7)
b. −2.1−(5.9 3.7)−2.1−(5.9 3.7)
c. −(2.1−5.9) (−3.7)−(2.1−5.9) (−3.7)
d. −(2.1 5.9 3.7)