The correct answer is:
Upset by Utterson persistence.
Mr. Utterson, who´s the main narrator in the novel, has a rational, calm and curious personality. He is a lawyer and consequently a respectable and prosperous man in Victorian London. All these traits, in addition to his persistence, lead him to discover the truth about Dr. Jekyll and Mr. Hyde's relationship.
The title of Dorothea Lange's most well-known portrait is Migrant mother.
The correct answer is present progressive.
It means that there is some progression, that something is going on at the moment when this sentence is taking place. So, they are currently climbing to the top of the Aztec temple.
Present emphatic would be 'they do climb,' basic present would be 'they climb,' and present perfect would be 'they have climbed.'
