Present, or present perfect, that part is for you to figure out though! Sorry.
Assuming this question is in Spanish, and not English, the correct answer is B. first and second person plural.
Take a stem changing verb in Spanish, such as decir (= to say). This is how it's conjugated: yo digo, tu dices, el/ella dice, nosotros decimos, vosotros decis, dicen.
As you can see, nosotros and vosotros (first and second person plural) are the only forms whose stem doesn't change, whereas that change occurs in all other persons.
Answer:
when the employee will spend best of time with company "they will feel attachment like family" these kind of activities promote harmony and good feeling with each other