The correct answer is "hard," which is an adjective that describes the noun "job." In this case, "hard" functions as both an adjective and an adverb.
Adjective
In linguistics, an adjective is a describing word, the main syntactic role of which is to qualify a noun or noun phrase, giving more information about the object signified.
Adjectives are one of the English parts of speech, although they were historically classed together with the nouns. Certain words that were traditionally considered to be adjectives, including the, this, my, etc., are today usually classed separately, as determiners.
A1 / Elementary / Beginners
A CEFR A1 level English language user is considered a beginner. At this level, an individual is expected to have a basic understanding of the English language, including basic vocabulary and grammar. They should be able to understand and use simple phrases and sentences in order to meet basic needs and engage in simple, everyday conversations. They should also be able to understand simple instructions and signs in English.
At A1 level, they are able to understand and use familiar everyday expressions and very basic phrases aimed at the satisfaction of needs of a concrete type. They can introduce him/herself and others and can ask and answer questions about personal details such as where he/she lives, people he/she knows and things he/she has. They can interact in a simple way provided the other person talks slowly and clearly and is prepared to help.
Difficulty: Easy
Easy difficulty. Difficulty levels represent author's opinion about how hard a question or challenge is.