What is the best practice for data table cell content alignment

We are currently working on a windows based application where users capture data. Some data is captured in a table where other data is captured in text blocks. Im currently faced with the dilemma of how to align contents specifically decimal values. Editable cells in a grid are indicated with a pencil icon which disappears once in edit mode. You will notice that the table consists of various field types, decimals and text. So what should I do and why?

A> right align all cell content

B> left align all cell content

C> right align only decimal values in cells

D> Whatever else you can suggest