From the given sentence form a feminine noun from the masculine word given:
The palace gates opened as the Prince arrived.
A. King
B. Queen
C. Princess
D. Heiress

Hint: Feminine nouns refer to words for women and girls as well as female animals. Masculine nouns belong to the masculine gender. Feminine nouns belong to the feminine gender. Choose the option that is the feminine noun of 'Prince'.

Complete answer:
Let us analyze the given options
Option A (king) is not the right answer. 'King' is already a masculine gender noun. The correct option to be chosen must be a feminine gender noun. Hence, this option is wrong.
Option B (Queen) is a female gender noun which is a counterpart of King and not prince. Thus, this option also does not make complete sense, therefore it is incorrect.
Option C (princess) is the correct answer. The sentence mentioned has ‘Prince’ as the male gender noun, which means the offspring of a King. Out of the given options, Option C, Princess, is the feminine counterpart to Prince. Therefore, the correct answer is Option C.
Option D, Heiress, is the female gender noun which is used as a term for the rightful successor to a kingdom. Thus, it is not the desired feminine gender noun. Therefore, this option is also wrong.

Hence, option C is the correct answer.

Note: In English, the four genders of nouns are masculine, feminine, common, and neuter. Masculine nouns refer to words for a male figure or male member of a species (i.e. man, boy, actor, horse, etc.) They are words for men, boys, and male animals. Feminine nouns are words for women, girls, and female animals. Common nouns refer to members of a species and do not specify the gender (i.e. parent, friend, client, student, etc.) Neuter nouns refer to things that have no gender (i.e. rock, table, pencil, etc.)