The correct answer is B. The name of the website
Step-by-step explanation:
The Modern Language Association or MLA is one the main associations that regulate language and academic texts, because of this the MLA is the author of a Manual and Guide to Scholarly Publishing which is the most common guide used for writing and publishing academic texts. This manual covers almost all aspects of academic texts including citations for which the MLA has determined the element and organization of these elements that should be included about the source depending on the type of source and features of it.
In the case of web pages without an author as the one presented in the question, the MLA establishes it is necessary to include the title of the web page; the publisher; the date of publication and the URL or web address and the date accessed. Considering this, according to the MLA the information that should be listed first in the citation of the source presented in the question is the name of the website or "A Day for Trees".