数列 {an}\left\{ {a}_{n}\right\}{an} 满足 a1∈(−12,0){a}_{1} \in \left( {-\frac{1}{2},0}\right)a1∈(−21,0) ,且 an+1=an−ln(1+an)(n∈N∗){a}_{n + 1} = {a}_{n} - \ln \left( {1 + {a}_{n}}\right) \left( {n \in {\mathbf{N}}^{ * }}\right)an+1=an−ln(1+an)(n∈N∗) ,则 ( )A. a2>15,S4>35{a}_{2} > \frac{1}{5},{S}_{4} > \frac{3}{5}a2>51,S4>53B. a2>15,S4<35{a}_{2} > \frac{1}{5},{S}_{4} < \frac{3}{5}a2>51,S4<53C. a2<15,S4>35{a}_{2} < \frac{1}{5},{S}_{4} > \frac{3}{5}a2<51,S4>53D. a2<15,S4<35{a}_{2} < \frac{1}{5},{S}_{4} < \frac{3}{5}a2<51,S4<53