Constant effort to achieve somethingPerseverance(हठ) = the act of pers
Right Answer is: A
Perseverance(हठ) = the act of persisting or persevering; continuing or repeating behavior.
Attempt(चेष्टा) = make an effort to accomplish something.
Enthusiasm(उत्साह) = overflowing with eager enjoyment or approval.
Vigour(ताक़त) = active strength of body or mind.
Hence, option A is the correct answer.