Can you explain problem 12 and 13 for me I have the right answers I just…

Can you explain problem 12 and 13 for me I have the right
answers I just don’t know how to know the difference. For 12 I was
stuck between A and B and for 13 I was also stuck between A and
B

( 12. Which compound below fits the following proton NMR data? triplet singlet quartet 81.22 (3H) 81.98 (3H). 84.07 (2H) A. ALO ZH-quartet 34 – triplet 3H-singlet hu 0 B) CH3COCH2CH3 A) CH3CH2COCH3 OCH3 DU CH,CCH OCH3 by H_c-c 3H-sin-high N ZH-n.-high 3H -t CH3 A) A B C C D D down desh 13. The proton NMR of 1,1-dibromoethane would appear as a a) downfield doublet and upfield quartet, B) downfield quartet and upfield doublet. downfield doublet and upfield triplet. downfield triplet and upfield doublet. upp _ 14. The proton NMR spectrum of a compound gives singlets at 8 2.10 and 8 2.56 in a ra 1. Which compound below is the best match for the spectrum?