Define and identify the use of Adverbs of Frequency-
Julie _______ listens to the rock music.
a) Loves to
b) Do not
c) Often
d) Always

Hint: Read the given sentence carefully. Try to make out the core meaning of it. Find out the subject, predicate, and object of the given sentence.

Complete answer:
An adverb is a word or phrase that qualifies or changes an adjective, verb, or another adverb, to express a relation of a situation, cause, etc. An adverb of frequency is used to describe how often something occurs, either in definite or indefinite terms.
Now, let us examine all the given options to find out the correct answer :
Option ‘a’ is Loves to. It is a noun that means an intense feeling of affection. It cannot be the correct answer and can’t be used in this sentence.
Option ‘b’ is Do not. It is a command or entreaty not to do something; forbidding someone to do something. It cannot be the correct answer as well.
Option ‘c' is Often. It is an adverb which means frequently. For example, He often goes for long walks. It can be the correct answer.
Option ‘d’ is Always. It is an adverb which means at all times; on all occasions. We can use it in the given blank in the sentence.
The correct answer is option ‘c’ and ‘d’ as always and often indicate how often she listens to rock music.

Note:
Some questions might accept more than one answer, and this is one of those rare questions. Both the answers ‘often’ and ‘always’ are correct.