Which sentence uses correct subject-verb agreement? Select one:

All of the children on the playground is having fun.

Sea creatures in the deepest parts of the ocean are difficult to photograph.

Runners in the marathon was told to get ready at the starting line.

Different colors of paper sits neatly in separate stacks.

try the first if wrong try b

Explanation:

sorry if wrong o

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.