The correct option is "interrogative adjective".
Interrogative adjectives are <u>words that modify nouns or other terms inside a question</u>. They can be compared to interrogative pronouns, but the difference is that <u>interrogative adjectives don't stand on their own and they always act in relation to another term</u>.
In this example the word "What" acts as an interrogative adjective that modifies the term "on Earth".
If the sentence would've been "What is causing all the excitement today?", then the word "what" would be functioning just as an interrogative pronoun.
Hope this helps!
B. They don't need much space. (I may be wrong)
If a coworker told me that they did not plan to return from their vacation, I would bring several points; It is irresponsible to quit without notice and deadlines cannot be met without the assistance of said coworker. By quitting irresponsibly they are negatively affecting other people's jobs and company success.
<span>C. At the age of 65, Hilda Ramirez competed in a triathlon and won the world championship for her age group.</span>
Ok let me weight one and I’ll come back in here and post it ok