Answer:
really don't know because you have only link and I have network problem
 
        
                    
             
        
        
        
I think it’s the third option 
If it’s not I’m so sorry
        
             
        
        
        

TOPIC:- PASSIVE VOICE 
QUESTION:- He was painting a portrait.
ANSWER:- A portrait was being painted by him
RULES FOR FORMATION:- 
1. Change the object into subject.
2. use 3rd form of verb .
3. use by and then use subect as object.
HOPE IT HELPES YOU.
 
        
             
        
        
        
A competing device is the Camera Lucida . "Camera Obscura" means "dark room", and the use of a pinhole in a window blind to form an inverted image of an outside scene on an opposite wall of a dark room.
 
        
             
        
        
        
Answer:
Shape An element of art that is two-dimensional, flat, or limited to height and width. volume; includes height, width AND depth (as in a cube, a sphere, a pyramid, or a cylinder). Form may also be free flowing.
Explanation: