The Wright Tricycle factory uses one seat, two handle grips, and three tires for every tricycle that it makes. Select a numeric ratio for the following phrase: the number of tires to the number of tricycles. A1:3
B3:1
C2:1
D3:2

the answer is b

Explanation:

well if you have a lion for example it will kill you and that's why you shouldn't have and exotic animal

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.