A triangle can have:

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1. In any triangle the angles add to $180^\circ$. 
2. Two obtuse angles mean each is $>90^\circ$, so their sum would exceed $180^\circ$, impossible. So (a) is false.
3. Two right angles give $90^\circ+90^\circ=180^\circ$, leaving $0^\circ$ for the third angle, impossible. So (b) is false.
4. Three angles of $70^\circ$ give $3	imes70^\circ=210^\circ$, which is more than $180^\circ$, so (d) is false.
5. Thus a triangle can have at most one obtuse angle; option (c) is correct.

FINAL_ANSWER: c

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