Which procedure involves the use of an injected radioactive tracer dye to create an image?

a. evoked potential studies
b. electroencephalography
c. magnetic resonance spectography
d. ct scan
e. positron emission tomography

answer:

1

explanation:

i'm pretty sure questions like these aren't allowd.   but, sure.   i can and talk : ))

for me i have felt invisible when i was clearly struggling,or,i made a great achievement ,and,nobody took to notice me either because they just didn't see it,or,people just turned their back on me.i can see a person being invisible by choice,or,without choice like i did.the people who are invisible by choice don't try to talk to people,don't try to make friends,and,keep to themselves.i haven't been one of those people so i couldn't give you a reason.

hope this and can i get bainliest my dude : d