The choices are not given, however, the question can still be solved.
<u>We know that:</u>pH + pOH = 14
<u>Converting the above equation to concentration form, we will get:</u>
[H₃O+] * [OH-] = 10⁻¹⁴
<u>We are given that:</u>
concentration of hydroxide ion [OH-] = 1.4 * 10⁻¹⁰ M
<u>Substitute with this in the above equation to get concentration of hydronium ion as follows:</u>
[H₃O+] * [OH-] = 10⁻¹⁴
[H₃O+] * [1.4 * 10⁻¹⁰ ] = 10⁻¹⁴
[H₃O+] = 
[H₃O+] = 7.1428 * 10⁻⁵ M
Hope this helps :)