A、m 2-(2m-n-p)=m 2-2m+n+p,故正确;
D、m-n+p-q=m-(n-p+q),故错误;
C、3m-5n-1+2p=-(-3m)-[5n-(2p-1)],故正确;
D、m+1-(-n+p)=m+1+n-p,-(-1-n-m+p)=1+n+m-p,左右两边相等,故正确.
故选B.
A、m 2-(2m-n-p)=m 2-2m+n+p,故正确;
D、m-n+p-q=m-(n-p+q),故错误;
C、3m-5n-1+2p=-(-3m)-[5n-(2p-1)],故正确;
D、m+1-(-n+p)=m+1+n-p,-(-1-n-m+p)=1+n+m-p,左右两边相等,故正确.
故选B.