The correct option is C Silicon is more electropositive than carbon due to which (CH3)3SiCH2COO− becomes less stable
The conjugate base of both acid are CH3−CH3|C|CH3−CH2−C||O−O−
CH3−CH3|Si|CH3−CH2−C||O−O−
Silicon is more electropositive than carbon due to which conjugate base ((CH3)3SiCH2COO−) becomes less stable and hence less acidic.