All of the sentences below are grammatically correct except one, which contains a comma splice. select the sentence that is not grammatically correct. question 2 options: she was so excited she started crying and laughing all at once, but my mother was less sure. she was so excited she started crying and laughing all at once. my mother was less sure. she was so excited she started crying and laughing all at once, my mother was less sure. she was so excited she started crying and laughing all at once; however, my mother was less sure.

C). She was so excited she started crying and laughing all at once, my mother was less sure.

Explanation:

A comma splice is illustrated as the grammatical error as a comma is employed to link two independent clauses with a comma instead of employing conjunction or semicolon.

In the given question, option A is not grammatically correct and contains a 'comma splice' as in this option only two independent clauses 'She was so excited she started crying and laughing all at once' and 'my mother was less sure' are joined with a comma(,) instead of using a conjunction(like but, although, etc.) or semicolon(;). The other options are grammatically correct as they are joined either by employing conjunction(like 'but' and 'and' in option A and B) or by a semicolon (in option D). Thus, option C is the correct answer.

the sentence that avoid faulty coordination is:

culture, which is well represented in philadelphia, plays a major role including theatre, music, and the visual arts.  

faulty coordination occurs when the writer gives equal importance two different ideas (clauses) which in fact are not equivalent. in order to correct a misplaced clause or idea, the writer can place less important or emphatic ideas in a relative clause as in the previous sentence.  

c, have a good day ~matya