Sentences are composed of subjects and predicates. The subject is the "doer" in a sentence, or what the sentence is about. A simple predicate is simply the main verb. Each sentence must have a main verb, and the easiest way to find it is to look for a word that shows action.
C. <span>the grammatical order of words.</span>
This sentence contains a participle, correctly punctuated.
The phrase <em>hiding in the brush </em>is the participle in this sentence (and it tells us what the leopard was doing), and it is correctly punctuated - there has to be a comma after this phrase because it is found in the beginning of the sentence, before the subject <em>the leopard. </em>
B || c
if two lines are parallel to the same line, those lines are parallel. Another way of looking at it is:
if a = b and b = c then a = c.
(If two values are equal to the same value, those values are equal)