Can someone please explain it to me ASAP??!!! This is Exponential Models

Solve for t. e^-0.42t = 0.69

A) The solution is t= .....

B) The solution is not a real number.

for t. 42t = 0.69 . . ... ct the correct choice below and, if necessary, fill in the answer box to complete your choice. The solution is t = (Type an integer or a decimal. Do not round until the final answer. Then round to four decimal places as needed. Use a comma to separate answers as needed.) B. The solution is not a real number