Final answer:
The lines "And, as his strength / Failed him at length" suggest that the character is becoming weaker, likely due to aging or extended exertion.
Step-by-step explanation:
The lines "And, as his strength / Failed him at length" suggest that the character is experiencing a decline in physical power. This can be inferred as the character's energy and ability to continue are diminishing over time. The correct answer to the question - What is suggested by the lines "And, as his strength / Failed him at length"? - is b) The character is getting older and weaker. These lines imply a sense of exhaustion and diminishing vitality, which is often associated with aging or the effects of a prolonged effort or ordeal. Such imagery is common in literature to depict a character reaching the limits of their endurance.