The subordinate clause in this example is: "if we look both ways", and it is an adverb.
Occasion causing incredible enduring, devastating and trouble such as a genuine mishap wrongdoing or common catastrophe
Here's a few sentences with 'a'.
Billy helped a girl find her lost cat.
Georgia found a stray cat in an alley.
Remi got a suitcase for her birthday.
I would say B, though transgress can be used two ways; with and without a verb. With a verb it means passing limitations such as dimensions of time or space (as used in Science-Fiction novels). Without a verb the word is used to represent "to violate a law". This could also be interpreted a violating a command, thereby commanding in its own right. While none of these options make great sense, B. "to command" makes the most sense (though C takes a close second).
What did you write?
Kind of a hard question and slightly confusing to answer
