Identify the verbal in this sentence as infinitive, gerund or participle. he lieth in wait secretly as a lion in his den: he lieth in wait to catch the (from psalm 10: 9)

The verbal in this sentence can´t be a gerund because all gerund verbs finish in "ing". Example: "smoking is a health hazzard"

The verbal in this sentence can´t be participle because participle verbs are used to describe tenses like present perfect and passive voice. Example: "We have swum in the deepest oceans"

Since none of the above are written in the text, you can say that the correct answer is an infinitive verbal tense becase we must use infinitives when two verbs are said or written in a row. Example:

"They want to speak with me".

"He lieth in wait to catch the poor..." This line contains an infinitive form of the verb.

the correct answer would be:  

a. adverb phrase

it is an infinitive phrase with a subject.