Rationalize the following trends.
[ R, s-trans, s-cis],
[ CH3, 0.7, 0.3],
[ CH2CH3, 0.55, 0.45],
[ iPr, 0.3, 0.7],
[ t-Bu, near 0, ∼1]

A) Increasing steric hindrance favors s-trans configuration
B) Bulky groups prefer s-cis conformation
C) Increased branching promotes s-trans orientation
D) Steric effects dominate in s-cis arrangement