While muscular strength is the ability of a muscle to exert maximum force against resistance, muscular endurance is the ability of a muscle to exert less than maximum force repeatedly, over a period of time. Thus, endurance is different from strength; it requires the ability to perform a muscular action for a prolonged time period.
I believe the answer is D
It began in the year of "Ancient Times"
Well by the way you put the question it seems like there are supposed to be answer choices but, since there are none. I'll still try to answer the question as best as possible
1. Comparing yourself to others is a bad way of trying to improve self esteem
2. Overthinking and overworking yourself is a bad way to improve self esteem
3. Trying to raise confidence in yourself takes time so you have to be patient
And that's all I can think of right now but I hope it helps!