One of the statements below contains a word used incorrectly or inappropriately. Choose the option which has the incorrect or inappropriate usage of the word.

The term "grave" appears in all four sentences, but its interpretation changes with context. 

In Option A, "went to grave" is incorrect; it should be "went to the grave," indicating the burial site (missing preposition).

Option B correctly uses "grave allegations," which means serious accusations. 

Option C accurately refers to "mother’s grave," denoting the burial site. 

Option D appropriately uses "grave matter," signifying a serious issue. 

Thus, Option A is the correct answer to this question.