Pick the correct option to complete the following sentence :
"He often ___________ cold in winter."

"He" is singular in nature. In simple present tense, the singular subject takes the verb in the third person with a -s. 
hence, the correct answer would be "catches."

Option B: "Is catching" shows a continuous nature, which does not fit the sentence's " often "e. 

Option D: "Have caught" shows the past nature, which also does not fit the present form of the original sentence. 

Option A: "catch" is the base form, if we want to use catch we would need something like "He does often catch cold."

Therefore, Option C is the correct answer.