The simple subject of this sentence is B. discovery.
Which is just an interrogative pronoun, it cannot be a subject. Important is an adjective, which cannot be a subject. You is an objective pronoun.
A. Search the online catalog before narrowing you topic
Answer:
Phones should be allowed in school because if the school does not have enough Chromebooks, students can use their phones. Furthermore, phones can help save the school from limited access to technology and save the school from wasting money. For example, if students do not have a Chromebook for a science class, they can use their phones to work on their science class. It can also help people communicate with each other, including something during an emergency. For example, parents can call their children to see where they are, how they are doing, what is going on in school, etc. That is a beneficial thing. Lastly, phones are useful for taking pictures of very long or detailed notes. For example, if a teacher writes much information about a physics unit and the student does not have enough time. The student can take a picture of the notes and move on quickly. After that, once they get home, they can write down all the notes that the teacher wrote. With that, it can help students efficiently. That is the last reason. Some people say that phones make students get distracted from learning new things. For example, a student might listen to music during class with a phone and not listen to the teacher's attention. If that happens, the teacher can take away their phone and give them back at the end of class. Some people also say that some students misuse their phones by doing something else instead of doing their school work. For example, using social media, However, if that happens, then the teachers can take the student's phone and give a warning at first. If the child still misbehaves like this, they can send the student to the office, then call their parents and tell them everything.
Explanation:
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