In England, America or Australia, many boys and girls study their own language, (19)______ is English, mathematics and another language, perhaps French, German or Spanish.

Read the following passage and choose the word (A, B, C, D) to indicate the correct word or phrase that best fits each of the numbered blanks.

In England, America or Australia, many boys and girls study their own language, (19)______  is English, mathematics and another language, perhaps French, German or Spanish.