Which of the following symptoms is likely to afflict an astronaut in space

(a) swollen feet,

(b) swollen face,

(c) headache,

(d) orientational problem?

(a) When a person is in standing position, legs hold the entire mass of a body due to gravitational pull. While in space, an astronaut feels weightlessness because of the absence of gravity. Therefore, swollen feet of an astronaut do not affect him/her in space.
(b) The apparent weightlessness in space causes swollen face.
Sense organs such as eyes, ears nose, and mouth constitute a person’s face. This symptom can affect an astronaut in space.
(c) Headaches are caused because of mental strain. It can affect the working of an astronaut in space.
(d) Space has different orientations. Therefore, the orientational problem can affect an astronaut in space.