Read the sentence below and complete the instruction that follows.

famed astronomer galileo began using a telescope to explore the mysteries of space and make discoveries that religious leaders of his time frowned upon.

identify the essential appositive.

religious leaders
famed astronomer
telescope
galileo

When we say essential appositive, this is the phrase that is considered as an important part of the sentence that describes the noun and cannot be omitted for this will change the thought of the sentence. Based on the given sentence above, the essential appositive would be "Famed Astronomer". The answer would be the first option.