The correct option is A CH3CH=CHCH3 predominates
CH3−CH2−CH2−CH3H2SO4−−−−→475 K
CH3−CH=CH−CH3
More symmetrical one (major product)
CH3−CH2−CH2−CH3H2SO4−−−−→475 K
CH2=CH−CH2−CH3
Less symmetrical one or unsymmetrical (minor product)
It is based on Saytzeff’s rule. According to this more symmetrical or more alkylated alkene predominates.