Question

my grandmother and i write differently from each other because of temporal differences in ______. formatting characteristics regional characteristics individual characteristics style characteristics

Explanation:

The question is about writing differences due to temporal (time - related) factors. Formatting characteristics relate to how text is formatted (like spacing, font), regional is about location - based, individual is about personal traits. Temporal differences in writing often relate to style changes over time (e.g., language evolution, writing conventions over generations). So "style characteristics" fits as writing style can change over time between generations.

Answer:

style characteristics