His first failure did not . . . . . . . . him from making another attempt.

The answer is D. deter.

To deter means to discourage someone from doing something. In this case, the first failure did not discourage the person from making another attempt.

The other options are not correct because:

• To interfere means to meddle in someone’s affairs. In this case, the first failure did not meddle in the person’s affairs.
• To forbid means to prohibit someone from doing something. In this case, the first failure did not prohibit the person from making another attempt.
• To frighten means to make someone afraid. In this case, the first failure did not make the person afraid.