What is the effect of using write() on an open file?

Using the write() method on an open file in Python directly writes data to that file. When a file is opened in write mode, this method allows you to input strings or data into the file, effectively updating its contents or adding new data to it. If the file already contains data, using write() will overwrite that data from the beginning of the file unless the file is opened in append mode. Hence, the correct understanding of the writes is that it facilitates the addition or modification of data within the file, making option B the accurate choice.