Correct Answer: enklgwln

Solution : Given:
w_ll_g_we_ln_k_e_l_ gk

To fill the series, we have to divide the series – w_ll_g_ / we_ln_k / _e_l_gk
Let's check each option –
First option: enklgwkn; w e ll n g k / we l ln g k / w e k l n gk (No repeated pattern has been found.)
Second option: enklgwln; w e ll n g k / we l ln g k / w e l l n gk (wellngk is repeated in the series.)
Third option: enklwgIn; w e ll n g k / we l ln w k / g e l l n gk (No repeated pattern has been found.)
Fourth option: enlkgwkn; w e ll n g l / we k ln g k / w e k l n gk (No repeated pattern has been found.)

So, the series becomes→wellngkwellngkwellngk. Hence, the second option is correct.