What does the phrase, “All a man had to do was keep his head” mean

The only thing humans/ a person had to do was to think clearly and remain calm despite the stress.

So when I read this I think about maybe sucide like if this man could have kept his head up he would still be alive this may not be the right awnser but it is my guess. Hope this helped sorry if it didnt

Step-by-step explanation:

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.