Right choice is (a) Modernizr 3.5.0
For explanation I would say: Modernizr 3.1.0, Modernizr 3.1.1, Modernizr 3.4.0 and Modernizr 3.5.0 are the updated versions of modernizr which fixes some bugs and some updated the feature. Modernizr 3.5.0 can detect CSS Grids. In this latest Modernizr, we use two syntaxes, one is Modernizr.cssgrid, and an old syntax Modernizer.cssgridlegacy. In addition, there is a polyfill available named PEP.