If you share space with other employees, when making phone calls, you should make sure that you a. speak as loudly and clearly as you want to b. whisper to avoid letting coworkers hear c. speak only loud enough to be heard on the phone d. leave the office before making business calls

If you share space with other employees, when making phone calls, you should make sure that you Speak only loud enough to be heard on the phone . Option C is correct.

When talking on the phone, we usually tend to shout because our volume increases if we’re not sure the other person can hear us. At work, this can be very annoying for those who surround you, the wont want to listen to your phone calls.  So the rule is to “Keep your voice down"and stay clear on the phone too.

the correct answer is:

this is an example of the writer telling through description rather than showing through dialogue.

sometimes writers like to explain explicitely what's happening instead of adding dialogues of the situations., which is the case in this passage,

summer because you get to tan and wear cooler clothes and go to the beach