NIMCET 2019 — Computer PYQ

 If the result of an arithmetic operation is too large (positive or negative) to fit into the resultant bit
group, then arithmetic overflow occurs.
 Overflow occurs if
 1. (+A) + (+B) = −C
 2. (−A) + (−B) = +C

In the first option, we have 1111 + 1101 which results 1 1100 (As per 2's Complement addition rule). Here,
 1 at the LSB of Result is overflow bit.