A central argument is a dominant and controlling argument.
For A) to be correct, it should be "The deli Worker gave him and her free slice of ham. For B) to be correct, it should be Eric told them about his Journey. For D) is also wrong! With that being said, C has the correct object pronouns.
The Petrarchan sonnet divides the 14 lines into two sections which are an eight-line stanza (octave) rhyming ABBAABBA, and a six-line stanza (sestet) rhyming CDCDCD or CDECDE.
U posted this on the english section i assume u meant math?