The correct answer is 'frequently.' Key Points - Let us see the meaning of Rarely: - Rarely: not often; seldom. - Example: I rarely drive above 50mph. - Let us see the meanings of the given options: - Seldom: not often;rarely. - Never: at no time in the past or future; not ever. - Always: at all times; on all occasions. - Frequently: regularly or habitually; often. - From the meanings of the given words, we can say that the word 'frequently' is the opposite of the meaning of the underlined word 'rarely'. - Hence, the correct answer is 'frequently.'