Light intensity variations are detected from a star in which the intensity remains essentially constant, except for the periodic, short, and regular increases and decreases by a fixed amount. What is the most likely explanation for this observation?
A) periodic ejection of a shell of absorbing gas and dust from the star, followed by its dispersion into interstellar space
B) eclipsing of one star by its companion in a binary star
C) periodic passage of a planet in front of the star's visible surface
D) pulsation of size, temperature, and intensity of a variable star
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