Review the passage. many veterans who are not homeless are nonetheless “precarious.” among the estimated 21.8 million veterans in this country, more than 1.5 million spend more than half of their income on housing—well above the recommended maximum threshold of 30 percent. which best explains why this statement is a fact, rather than an opinion?

there are multiple perspectives on this issue.

the author does not give precise, exact numbers.

it can be proven through research.

it expresses a belief that may not always be true.

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.