A sentence has been given in Active/Passive voice. Out of the four alternatives suggested below, select the one which best expresses the same sentence in Passive/Active voice. 
 

It Is being solved by us. 

We are solving it.

We are solving it.

Explanation:

• We are solving it.: This active construction correctly maintains the original meaning and reverses the subject and object.
• It will be solved by us.: This passive construction correctly reverses the subject and object but changes the tense from present continuous to future tense.
• We can solve it.: This active construction changes the meaning by introducing the idea of ability ("can") rather than the ongoing action of solving.
• We have to solve it.: This active construction changes the meaning by introducing the idea of necessity ("have to") rather than the ongoing action of solving.