The word “journal” originally meant mere “daily paper", but now

The word “journal” originally meant mere “daily paper", but now has come to include any “periodical”.The above example reflects one type of changes in word meaning, that is（）.
A、extension
B、narrowing
C、degradation
D、elevation
【正确答案】：A
【题目解析】：单词在语法环境中词义会延深。