The answer in the space provided is madrigal, this has been
originated from Italy and England and they were considered to be the most
advance secular vocal form during the period of renaissance compared to other
secular vocal forms during this period.
The correct option is B. The rule is when one of the nouns connected by 'or' or 'nor' is plural then the verb must be plural and the plural subject should be placed next to the verb. Here, 'Surendra' is singular subject and 'his friends' is plural subject thus 'have been' is used which is plural verb. Hence, 'Have been' is the best fit according to the rule
Tropics- Most tropics are close to the equator, much hotter than any of the polar zones
Temprate- located in areas including the us, europe australia any place in the middle of the equator ir eaither polar zones
Polar- Explaintory! Antarica and North Pole! Coldest place on earths