[SC.5.L. 17.1] Celia saw a goldfish at the pet store that was living in a tank by itself. She bought the fish,
took it home, and put it in her aquarium with her
other goldfish. What must the new goldfish do to
survive in its new environment?
a. It must camouflage itself to its new surroundings.
b. It must compete with other goldfish for resources.
c. It must allow other goldfish to use the limited
resources first
d. It must build a home that is similar to the one in its
previous habitat.

B i think or C

Explanation:

not everyone is always right.

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.